Minnesota Administrative Rules

CHAPTER 1346, MINNESOTA MECHANICAL AND FUEL GAS CODES

DEPARTMENT OF LABOR AND INDUSTRY

MINNESOTA MECHANICAL CODE

1346.0050 TITLE; INCORPORATION BY REFERENCE.

This chapter is known and may be cited as the "Minnesota Mechanical Code." As used in this chapter, "the code" and "this code" refer to this chapter.

Chapters 2 to 15 of the 2006 edition of the International Mechanical Code, promulgated by the International Code Council, Inc., 500 New Jersey Avenue NW, 6th Floor, Washington, DC 20001-2070, are incorporated by reference as part of the Minnesota Mechanical Code as amended in this chapter. Portions of this chapter reproduce text and tables from the International Mechanical Code. The International Mechanical Code is copyright 2006 by the International Code Council, Inc. All rights reserved. As used in this chapter, "IMC" means the International Mechanical Code incorporated in this part.

The IMC is not subject to frequent change and a copy of the IMC, with amendments for use in Minnesota, is available in the office of the commissioner of labor and industry.

Chapters 1 to 15 of the 2008 edition of NFPA 96 Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, promulgated by the National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471, are incorporated by reference as part of the Minnesota Mechanical Code as amended in this chapter. Portions of this chapter reproduce text and tables for the NFPA 96. The NFPA 96 is copyright 2008 by the National Fire Protection Association. All rights reserved. As used in this chapter, "NFPA 96" means the NFPA 96 Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations incorporated into this part.

The NFPA 96 is not subject to frequent change and a copy of the NFPA 96, with amendments for use in Minnesota, is available in the office of the commissioner of labor and industry.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

15 SR 71; 19 SR 1306; 29 SR 299; L 2007 c 140 art 1 s 1; art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0060 REFERENCES TO OTHER INTERNATIONAL CODE COUNCIL (ICC) CODES.

Subpart 1.

General.

References to other codes and standards promulgated by the International Code Council in the IMC and IFGC are modified in subparts 2 to 11.

Subp. 2.

Building code.

References to the International Building Code in this code mean the Minnesota Building Code, adopted pursuant to chapter 1305 and Minnesota Statutes, section 326B.106, subdivision 1.

Subp. 3.

Residential code.

References to the International Residential Code in this code mean the Minnesota Residential Code, adopted pursuant to chapter 1309 and Minnesota Statutes, section 326B.106, subdivision 1.

Subp. 4.

Electrical code.

References to the International Code Council Electrical Code in this code mean the Minnesota Electrical Code, adopted pursuant to chapter 1315 and Minnesota Statutes, section 326B.35.

Subp. 5.

Fuel gas code.

References to the International Fuel Gas Code in this code mean the Minnesota Fuel Gas Code, adopted pursuant to chapter 1346 and Minnesota Statutes, section 326B.106, subdivision 1.

Subp. 6.

Mechanical code.

References to the International Mechanical Code in this code mean the Minnesota Mechanical Code, adopted pursuant to chapter 1346 and Minnesota Statutes, section 326B.106, subdivision 1.

Subp. 7.

Plumbing code.

References to the International Plumbing Code in this code mean the Minnesota Plumbing Code, adopted pursuant to chapter 4715 and Minnesota Statutes, section 326B.106, subdivisions 1 and 2.

Subp. 8.

Private sewage disposal code.

References to the International Private Sewage Disposal Code in this code mean the Minnesota Pollution Control Agency's minimum standards and criteria for individual sewage treatment systems adopted pursuant to chapter 7080 and Minnesota Statutes, chapters 103F, 103G, 115, and 116.

Subp. 9.

Energy conservation code.

References to the International Energy Conservation Code in this code mean the Minnesota Energy Code, adopted pursuant to Minnesota Statutes, section 326B.115.

Subp. 10.

Property maintenance code.

References to the International Property Maintenance Code in this code do not apply.

Subp. 11.

Fire code.

References to the International Fire Code in this code mean the Minnesota State Fire Code, adopted pursuant to chapter 7511 and Minnesota Statutes, chapter 299F.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 5 s 32; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0101 SECTION 101 SCOPE.

IMC Section 101 is amended to read as follows:

101 Scope. This code shall regulate the design, installation, maintenance, alteration, and inspection of mechanical systems that are permanently installed and utilized to provide control of environmental conditions and related processes within buildings. Fuel gas piping systems, fuel gas utilization equipment, and related accessories shall be regulated by parts 1346.5050 through 1346.6000.

This code shall also regulate those mechanical systems, system components, equipment, and appliances specifically addressed in the IMC and IFGC. This code shall also regulate process piping installed within, or in conjunction with, buildings or structures. For the purposes of this section, the term "process piping" includes piping or tubing which conveys gas, liquid, or fluidized solids and which is used directly in research, laboratory, or production processes. Process piping and tubing shall be installed in accordance with ASME B31.3-2006, Process Piping Code, or ASME B31.9-2008, Building Services Piping Code, as applicable. Refer to chapter 1300 for additional administrative provisions of the Minnesota State Building Code. For purposes of this section, refer to Minnesota Statutes, section 13.37, subdivision 1, paragraph (b), on disclosure of nonpublic data.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0102 SECTION 102 EXISTING INSTALLATIONS.

IMC Section 102 is amended to read as follows:

102 Existing installations. Except as otherwise provided for in this chapter, a provision in this code shall not require the removal, alteration, or abandonment of, nor prevent the continued utilization and maintenance of, a mechanical system lawfully in existence at the time of the adoption of this code.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0103 SECTION 103 MAINTENANCE.

IMC Section 103 is amended to read as follows:

103 Maintenance. Mechanical systems, both existing and new, and parts of those systems, shall be maintained in proper operating condition in accordance with the original design and in a safe and sanitary condition. Devices or safeguards which are required by this code shall be maintained in compliance with the code edition under which they were installed. The owner or the owner's designated agent shall be responsible for maintenance of mechanical systems. To determine compliance with this provision, the building official shall have the authority to require a mechanical system to be reinspected.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0104 SECTION 104 ADDITIONS, ALTERATIONS, RENOVATIONS, OR REPAIRS.

IMC Section 104 is amended to read as follows:

104 Additions, alterations, renovations, or repairs. Additions, alterations, renovations, or repairs to a mechanical system shall conform to that required for a new mechanical system without requiring the existing mechanical system to comply with all of the requirements of this code. Additions, alterations, renovations, or repairs shall not cause an existing mechanical system to become unsafe, hazardous, or overloaded.

Minor additions, alterations, renovations, and repairs to existing mechanical systems shall meet the provisions for new construction, unless that work is done in the same manner and arrangement as was in the existing system, is not hazardous, and is approved.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0105 SECTION 105 WORK EXEMPT FROM PERMIT.

IMC Section 105 is amended to read as follows:

105 Work exempt from permit. Permits shall not be required for the following:

1. portable heating, cooking, or clothes drying appliances not connected to a permanent fuel supply, excluding a factory power supply cord;

2. portable ventilation appliances and equipment;

3. portable cooling units;

4. steam, hot water, or chilled water piping within any heating or cooling equipment or appliances regulated by this code;

5. replacement of any minor part that does not alter the approval of equipment or an appliance or make such equipment or appliance unsafe;

6. portable evaporative coolers; and

7. self-contained refrigeration systems that contain 10 pounds (4.5 kg) or less of refrigerant, or that are actuated by motors of 1 horsepower (0.75 kW) or less.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0106 SECTION 106 REQUIRED INSPECTIONS.

IMC Section 106 is amended to read as follows:

106 Required inspections. The building official, upon notification from the permit holder or the permit holder's agent, shall make the following inspections and other such inspections as necessary, and shall either release that portion of the construction or shall notify the permit holder or the permit holder's agent of violations that must be corrected. The holder of the permit shall be responsible for the scheduling of these inspections.

1. Underground inspection shall be made after trenches or ditches are excavated and bedded, piping installed, and before backfill is put in place. When excavated soil contains rocks, broken concrete, frozen chunks, and other rubble that would damage or break the piping or cause corrosive action, clean backfill shall be on the job site.

2. Rough-in inspection shall be made after the roof, framing, fireblocking, and bracing are in place and all ducting and other components to be concealed are complete, and prior to the installation of wall or ceiling membranes.

3. Final inspection shall be made upon completion of the mechanical system.

Exception: Ground-source heat pump loop systems tested in accordance with this code shall be permitted to be backfilled prior to inspection.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0107

[Repealed, 34 SR 537]

Published Electronically:

October 23, 2009

1346.0108

[Repealed, 29 SR 299]

1346.0108 SECTION 108 AUTHORITY TO CONDEMN MECHANICAL SYSTEMS.

IMC Section 108 is amended to read as follows:

108 Authority to condemn mechanical systems. Whenever the building official determines that any mechanical system or portion of a system regulated by this code has become hazardous to life, health, or property, or has become insanitary, the building official shall order in writing that the system either be removed or restored to a safe condition. A time limit for compliance with the building official's order shall be specified in the written order. A person shall not use or maintain a defective mechanical system after receiving a notice under this section.

When a mechanical system is to be disconnected, written notice shall be given. In cases of immediate danger to life or property, the disconnection shall be made immediately without notice.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

19 SR 1306; 29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0109 SECTION 109 AUTHORITY TO ORDER DISCONNECTION OF ENERGY SOURCES.

IMC Section 109 is amended to read as follows:

109 Authority to order disconnection of energy sources. The building official shall have the authority to order disconnection of energy sources supplied to a building, structure, or mechanical system regulated by this code, when it is determined that the mechanical system or any portion of the system has become hazardous or unsafe. Written notice of an order to disconnect service and the causes of the order shall be given within 24 hours to the owner and occupant of the building, structure, or premises, provided, however, that in cases of immediate danger to life or property, the disconnection shall be made immediately without notice. Where energy sources are provided by a public utility, the building official shall immediately notify the serving utility in writing of the issuance of an order to disconnect.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0110 SECTION 110 CONNECTION AFTER ORDER TO DISCONNECT.

IMC Section 110 is amended to read as follows:

110 Connection after order to disconnect. A person shall not make energy source connections to mechanical systems regulated by this code which have been disconnected or ordered to be disconnected by the building official, or the use of which has been ordered to be discontinued by the building official until the building official authorizes the reconnection and use of such mechanical systems.

When a mechanical system is maintained in violation of this code, and in violation of a notice issued pursuant to this section, the building official shall institute appropriate action to prevent, restrain, correct, or abate the violation.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0201

[Repealed, 19 SR 1306]

1346.0201 SECTION 201 GENERAL.

IMC Section 201.4 is amended to read as follows:

201.4 Terms not defined. Where terms are not defined through the methods authorized by this chapter, the Merriam-Webster Collegiate Dictionary, available at www.m-w.com, shall be considered as providing ordinarily accepted meanings. The dictionary is incorporated by reference, is subject to frequent change, and is available through the Minitex interlibrary loan system.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0202 SECTION 202 GENERAL DEFINITIONS.

IMC Section 202 is amended by adding or amending the following definitions:

CLOSED COMBUSTION SOLID FUEL BURNING APPLIANCE. A heat producing appliance that employs a combustion chamber having no openings other than the flue collar, fuel charging door, and adjustable openings provided to control the amount of combustion air that enters the combustion chamber and includes doors with gaskets or flanges that permit tight closure and glass or ceramic panels which must be tightly sealed or gasketed at their frames.

DECORATIVE SOLID FUEL BURNING APPLIANCE. A natural draft appliance, usually a fireplace, intended primarily for viewing of the fire and which may or may not incorporate doors that substantially close off the firebox opening when the appliance is in operation.

EXHAUST SYSTEM. An assembly of connected ducts, plenums, fittings, registers, grilles and hoods, including domestic kitchen exhaust hoods, domestic kitchen and bathroom exhaust fans, clothes dryers, central vacuums, and radon exhaust systems through which air is conducted from the space or spaces and exhausted to the outside atmosphere or an attached residential garage.

FAN-ASSISTED APPLIANCE. An appliance equipped with an integral mechanical means to either draw or force products of combustion through the combustion chamber or heat exchanger.

POWER VENT APPLIANCE. An appliance with a venting system which uses a fan or other mechanical means to cause the removal of flue or vent gases under positive static vent pressure.

POWERED MAKEUP AIR. Air which must be brought in from the outdoors by means of a fan to replenish the air expelled by a mechanical exhausting device.

READY ACCESS (TO). That which enables a device, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction, and without requiring the use of portable access equipment (see "Access").

SEALED. Secured with a product meeting UL 181 or equivalent.

SOLID FUEL APPLIANCE. A natural draft appliance that is either a closed combustion solid fuel burning appliance or a decorative solid fuel burning appliance.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0203

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0204

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0301 SECTION 301 GENERAL.

IMC Section 301.4 is amended to read as follows:

301.4 Listed and labeled. Appliances regulated by this code shall be listed and labeled to an appropriate standard by a nationally recognized testing laboratory which is qualified to evaluate the appliance, unless otherwise approved in accordance with the administrative provisions of the Minnesota State Building Code, Minnesota Rules, chapter 1300. The approval of unlisted appliances shall be based upon engineering evaluation. Unlisted appliances shall be installed with clearances to combustibles in accordance with NFPA 211-2006 Standard for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances; NFPA 31-2006 Standard for the Installation of Oil Burning Equipment; or NFPA 90B-2009 Standard for the Installation of Warm Air Heating and Air-Conditioning Systems, as applicable to the unlisted appliances. Unlisted appliances with a fuel input rating of less than 12,500,000 Btu/hr (3,660 kW) shall have fuel trains, controls, and safety devices installed in accordance with Part CF, Combustion Side Control, of ASME CSD-1-2006. Unlisted appliances with a fuel input rating of 12,500,000 Btu/hr (3,660 kW) or greater shall have fuel trains, controls, and safety devices installed in accordance with NFPA 85-2007.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0302

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0304

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0306 SECTION 306 ACCESS AND SERVICE SPACE.

IMC Section 306.5 is amended to read as follows:

306.5 Mechanical equipment and appliances on roofs or elevated structures. Where mechanical equipment or appliances requiring periodic inspection, service, or maintenance are installed on roofs or elevated structures, a permanent stair shall be provided for access.

Exception: A portable ladder may be used for dwellings, replacement equipment on existing buildings, and exterior roof access points not exceeding 16 feet (4.9 m) above grade, unless the building official determines that the unique shape of the roof does not allow safe access with a portable ladder.

The permanent stair shall be as required by relevant safety regulations, but shall not be less than the following:

1. The stair shall be installed at an angle of not more than 60 degrees measured from the horizontal plane.

2. The stair shall have flat treads at least 6 inches (152 mm) deep and a clear width of at least 18 inches (457 mm) with equally spaced risers at least 10.5 inches (267 mm) high and not exceeding 14 inches (356 mm).

3. The stair shall have intermediate landings not exceeding 18 feet (5.5 m) vertically.

4. Continuous handrails shall be installed on both sides of the stair.

5. Interior stairs shall terminate at the under side of the roof at a hatch or scuttle of at least 8 square feet (0.74 m²) with a minimum dimension of 20 inches (508 mm).

6. When a roof access hatch or scuttle is located within 10 feet (3.0 m) of a roof edge, a guard shall be installed in accordance with IMC Section 304.10.

7. Exterior stairs shall terminate at the roof access point or at a level landing of at least 8 square feet (0.74 m²) with a minimum dimension of 20 inches (508 mm). The landing shall have a guard installed in accordance with IMC Section 304.10.

306.5.1 Permanent ladders. Where a change in roof elevation greater than 30 inches (762 mm) but not exceeding 16 feet (4.9 m) exists, a permanent ladder shall be provided. The ladder may be vertical and shall be as required by relevant safety regulations, but shall not be less than the following:

1. Width shall be at least 16 inches (406 mm).

2. Rung spacing shall be a maximum of 14 inches (356 mm).

3. Toe space shall be at least 6 inches (152 mm).

4. Side railings shall extend at least 30 inches (762 mm) above the roof or parapet wall.

306.5.2 Electrical requirements. A receptacle outlet shall be provided at or near the equipment location in accordance with the ICC Electrical Code.

306.5.3 Sloped roofs. Where appliances, equipment, fans, or other components that require service are installed on a roof having a slope of three units vertical in 12 units horizontal (25-percent slope) or greater and having an edge more than 30 inches (762 mm) above grade at such edge, a level platform shall be provided on each side of the appliance to which access is required for service, repair, or maintenance. The platform shall be at least 30 inches (762 mm) in any dimension and shall be provided with guards. The guards shall extend at least 42 inches (1067 mm) above the platform, shall be constructed so as to prevent the passage of a 21-inch-diameter (533 mm) sphere and shall comply with the loading requirements for guards specified in the International Building Code.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0309 SECTION 309 TEMPERATURE CONTROL.

IMC Section 309 is amended by adding a section to read as follows:

309.2 Balancing. All mechanical ventilation and hydronic systems shall be capable of being balanced in accordance with this section.

309.2.1 Mechanical ventilation system balancing. Mechanical ventilation systems shall provide airflow rates within +/-10 percent of design capacities and fan speed shall be adjusted to meet design airflow conditions.

Exceptions:

1. Speed adjustment is not required for fan motors rated at one horsepower (0.746 kW) or less.

2. Residential exhaust-only ventilation systems shall be capable of exhausting the minimum ventilation rate required in the Minnesota Energy Code, Minnesota Rules, chapter 7670 or 7672.

309.2.2 Hydronic system balancing. Hydronic systems shall provide flow rates within +/-10 percent of design capacities and pump impellers shall be trimmed or pump speed shall be adjusted to meet design flow conditions.

Exception: Impeller trimming or speed adjustment is not required for pump motors rated at five horsepower (3.73 kW) or less.

309.2.3 Systems balancing reports. Systems balancing reports shall verify system performance and shall specify that the minimum amount of outdoor air required in amended Chapter 4 is provided to the ventilation system. Systems balancing reports shall be submitted to the building official upon request.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326.13

History:

15 SR 71; 29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0401 SECTION 401 GENERAL.

IMC Section 401.4 is amended to read as follows:

401.4 Opening location. Outside air exhaust and intake openings, in buildings other than dwellings and Group R-3 occupancies, shall be located a minimum of 10 feet (3048 mm) from lot lines or buildings on the same lot. Where openings front on a street or public way, the distance shall be measured to the centerline of the street or public way.

401.4.1 Intake openings. Mechanical outside air intake openings shall be located a minimum of 10 feet (3048 mm) from any hazardous or noxious contaminant, such as chimneys, plumbing vents, streets, alleys, parking lots, and loading docks, except as otherwise specified in this code. Where a source of contaminant is located within 10 feet (3048 mm) of an intake opening, the intake opening shall be located a minimum of 3 feet (914 mm) below the contaminant source, unless the intake opening is a combustion air intake of a direct-vent appliance.

401.4.2 Exhaust openings. Outside exhaust openings, including bathroom exhaust, toilet exhaust, domestic kitchen range exhaust, and domestic clothes dryer exhaust, shall be located at least 3 feet (914 mm) from doors, operable windows, and nonmechanical intake openings. Exhaust air shall not be directed onto public walkways.

401.4.3 Flood hazard. For structures located in flood hazard areas, outdoor exhaust openings shall be at or above the design flood elevation.

401.4.4 Venting system terminations. Venting system terminations shall comply with IMC Section 804 and IFGC Section 503.8.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0403

[Repealed, 19 SR 1306]

1346.0403 SECTION 403 MECHANICAL VENTILATION.

Subpart 1.

Section 403.1.

IMC Section 403.1 is amended to read as follows:

403.1 Ventilation system. Mechanical ventilation shall be provided by a method of supply air and return or exhaust air. The amount of supply air shall be approximately equal to the amount of return and exhaust air. The system to convey ventilation air shall be designed and installed in accordance with IMC Chapter 6.

Ventilation supply systems shall be designed to deliver the required rate of supply air to the occupied zone within an occupied space. The occupied zone shall have boundaries measured at 3 inches (76 mm) and 72 inches (1829 mm) above the floor and 24 inches (610 mm) from the enclosing walls.

Subp. 2.

Section 403.2.

IMC Section 403.2 is amended to read as follows:

403.2 Outdoor air required. The minimum ventilation rate of required outdoor air shall be determined in accordance with the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004.

Exceptions:

1. Enclosed parking garages shall comply with amended IMC Section 404.

2. Dwellings that are required to comply with Minnesota Rules, chapter 1322.

3. Buildings or portions of buildings that are not intended for normal human occupancy, or where the primary purpose is not associated with human comfort.

403.2.1 Recirculation of air. The air required by the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004, shall not be recirculated. Air in excess of that required shall not be prohibited from being recirculated as a component of supply air to building spaces, except that:

1. Ventilation air shall not be recirculated from one dwelling unit to another or to dissimilar occupancies.

2. Supply air to a swimming pool and associated deck areas shall not be recirculated unless the air is dehumidified to maintain the relative humidity of the area at 60 percent or less. Air from this area shall not be recirculated to other spaces.

3. Where mechanical exhaust is required by the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004, recirculation of air from such spaces shall be prohibited. All air supplied to such spaces shall be exhausted, including any air in excess of that required.

403.2.2 Transfer air. Except where recirculation from such spaces is prohibited by the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004, air transferred from occupied spaces is not prohibited from serving as makeup air for required exhaust systems in such spaces as kitchens, baths, toilet rooms, elevators, and smoking lounges. The amount of transfer air and exhaust air shall be sufficient to provide the flow rates as specified in the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004. The required outdoor air rates shall be introduced directly into such spaces or into the occupied spaces from which air is transferred, or a combination of both.

Subp. 3.

Section 403.3.

IMC Section 403.3 is amended to read as follows:

403.3 Ventilation rate. Ventilation systems shall be designed to have the capacity to supply the minimum outdoor airflow rate determined in accordance with the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004 or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004, based on the occupancy of the space and the occupant load or other parameters as stated therein. The occupant load utilized for design of the ventilation system shall not be less than the number determined from the estimated maximum occupant load rate indicated in the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004. Ventilation rates for occupancies not represented shall be determined by an approved engineering analysis. The ventilation system shall be designed to supply the required rate of ventilation air continuously during the period the building is occupied, except as otherwise stated in other provisions of the code.

Exception: The occupant load is not required to be based on the estimated maximum occupant load rate where approved statistical data document the accuracy of an alternate anticipated occupant density.

Subp. 4.

Section 403.3.1.

IMC Section 403.3.1 is amended to read as follows:

403.3.1 System operation. The minimum flow rate of outdoor air that the ventilation system must be capable of supplying during its operation shall be permitted to be based on the rate per person indicated in the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004, and the actual number of occupants present.

Subp. 5.

Section 403.3.4.

IMC Section 403.3.4 is amended to read as follows:

403.3.4 Balancing. Ventilation systems shall be balanced in accordance with amended IMC Section 309.2.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0404 SECTION 404 GARAGES.

Subpart 1.

Section 404.1.

IMC Section 404.1 is amended to read as follows:

404.1 Enclosed parking garages. Mechanical ventilation systems for enclosed parking garages shall provide a minimum exhaust rate of 0.75 cfm per square foot (0.228m³ per minute per square meter) of floor area. Mechanical ventilation systems are not required to operate continuously where the system is arranged to operate automatically upon detection of a concentration of carbon monoxide of 25 parts per million (ppm) by approved automatic detection devices.

Subp. 2.

Section 404.2.

IMC Section 404.2 is amended to read as follows:

404.2 Motor vehicle repair garages. Mechanical ventilation systems for motor vehicle repair garages shall provide a minimum exhaust rate of 0.75 cfm per square foot (0.228m³ per minute per square meter) of floor area.

Subp. 3.

Section 404.3.

IMC Section 404.3 is amended to read as follows:

404.3 Occupied spaces accessory to public garages. Connecting offices, waiting rooms, ticket booths, and similar uses that are accessory to a public garage shall be maintained at a positive pressure and shall be provided with ventilation in accordance with the Ventilation Rate Procedure, Section 6.2 of ASHRAE 62.1-2004, or the Indoor Air Quality Procedure, Section 6.3 of ASHRAE 62.1-2004.

Subp. 4.

Section 404.4.

IMC Section 404.4 is amended by adding a section to read as follows:

404.4 Prohibition of heated commercial parking garages. Commercial parking garages shall comply with the Minnesota Commercial Energy Code, chapter 1323.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

15 SR 71; 29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0405

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0406

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0407

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0408

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0409

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0410

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0411

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0414

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0418

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0421

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0424

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0501 SECTION 501 GENERAL.

Subpart 1.

Section 501.2.

IMC Section 501.2 is amended to read as follows:

501.2 Exhaust discharge. The air removed by every mechanical exhaust system shall be discharged outdoors at a point where it will not cause a nuisance and not less than the distances specified in Section 501.2.1. The air shall be discharged to a location from which it cannot again be readily drawn in by a ventilating system. Air shall not be exhausted into an attic or crawl space and the exhaust system shall be equipped with a backdraft damper at the point of discharge.

Exception:

1. Commercial cooking recirculating systems.

Subp. 2.

Section 501.3.

IMC Section 501.3 is amended to read as follows:

501.3 Pressure equalization. Mechanical exhaust systems shall be sized and operated to remove the quantity of air required by this chapter. If a greater quantity of air is supplied by a mechanical ventilating supply system than is removed by a mechanical exhaust system for a room, adequate means shall be provided for the natural exit of the excess air supplied.

501.3.1 Makeup air in new dwellings. Makeup air quantity for new dwellings shall be determined by using Table 501.3.1 and shall be supplied in accordance with IMC Section 501.3.2.

Exception. Makeup air provisions of IMC Section 501.3.1 are not required when any of the following are demonstrated:

1. A test is performed according to ASTM Standard E1998-02 ( 2007), Standard Guide for Assessing Depressurization-Induced Backdrafting and Spillage from Vented Combustion Appliances, and documentation is provided that the vented combustion appliances continue to operate within established parameters of the test.

2. A test approved by the building official verifies proper operation of vented combustion appliances.

501.3.2 Makeup air supply. Makeup air shall be provided by one of the following methods:

1. Passive makeup air shall be provided by passive openings according to the following:

1.1 Passive makeup air openings from the outdoors shall be sized according to Table 501.3.2.

1.2 Barometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance is installed.

1.3 Single passive openings larger than 8 inches (204 mm) diameter, or equivalent, shall be provided with a motorized damper that is electrically interlocked with the largest exhaust system.

2. Powered makeup air shall be provided if the size of a single opening or multiple openings exceeds 11 inches (280 mm) diameter, or equivalent, when sized according to Table 501.3.2. Powered makeup air shall comply with the following:

2.1 Powered makeup air shall be electrically interlocked with the largest exhaust system.

2.2 Powered makeup air shall be matched to the airflow of the largest exhaust system.

3. Makeup air shall be provided by a combination of passive openings and powered means according to Table 501.3.2 and the following:

3.1 Passive makeup air openings shall comply with Item 1.

3.2 Powered makeup air shall be supplied for the quantity of airflow in excess of the passive makeup air opening provided, and it shall be electrically interlocked with the exhaust system.

501.3.2.1 Makeup air ducts. Makeup air ducts shall be constructed and installed according to IMC Chapter 6 and Section 501.3.2.

501.3.2.2 Makeup air intake. Makeup air intake openings shall be located to avoid intake of exhaust air in accordance with IMC Section 401.5.2 and IFGC Section 503.8, and shall be covered with corrosion resistant screen of not less than 1/4 inch (6.4 mm) mesh. Makeup air intake openings shall be located at least 12 inches (305 mm) above adjoining grade level.

501.3.2.3 Makeup air location. Makeup air requirements of 175 cubic feet per minute (cfm) (0.084 m³/s) and greater shall be introduced to the dwelling in one of the following locations:

1. In the space containing the vented combustion appliances.

2. In the space containing the exhaust system.

3. In a space that is freely communicating with the exhaust system and is approved by the building official.

501.3.2.4 Makeup air termination restriction. A makeup air opening shall not terminate in the return air plenum of a forced air heating system unless it is installed according to the heating equipment manufacturer's installation instructions.

501.3.2.5 Separate makeup air and combustion air openings. When both makeup air and combustion air openings are required, they shall be provided through separate openings to the outdoors. Refer to IFGC Section 304, to determine requirements for air for combustion and ventilation.

Exception: Combination makeup air and combustion air systems may be approved by the building official where they are reasonably equivalent in terms of health, safety, and durability.

501.3.2.6 Makeup air effectiveness. The makeup air shall not reduce the effectiveness of exhaust systems or performance of vented combustion appliances, and makeup air shall not adversely affect the heating or cooling capability of the mechanical equipment.

501.3.3 Additions, alterations, or installations of mechanical systems in existing dwellings. Makeup air shall be supplied to existing dwellings when any of the following conditions occur:

1. If a dwelling was constructed after 2003 using the makeup air provisions of IMC Section 501.3.2, makeup air quantity shall be determined by using Table 501.3.1 and shall be supplied according to IMC Section 501.3.2 when any of the following conditions occur:

1.1 A vented combustion appliance, including a solid fuel appliance, is installed or replaced.

1.2 An exhaust system is installed or replaced.

Exception: If powered makeup air is electrically interlocked and matched to the airflow of the exhaust system, additional makeup air is not required.

2. If a dwelling was constructed after 1999 using the provisions of the Minnesota Energy Code, Minnesota Rules, chapter 7672, makeup air quantity shall be determined by using IMC Table 501.3.1 and shall be supplied in accordance with IMC Section 501.3.2 when any of the following conditions occur:

2.1 A vented combustion appliance, including a solid fuel appliance, is installed or replaced.

2.2 An exhaust system is installed or replaced.

Exception: If powered makeup air is electrically interlocked and matched to the airflow of the exhaust system, additional makeup air is not required.

3. When a solid fuel appliance is installed in a dwelling constructed during or after 1994 under the Minnesota Energy Code, Minnesota Rules, chapter 7670, makeup air quantity shall be determined by using IMC Table 501.3.1 and shall be supplied according to IMC Section 501.3.2.

Exception. If a closed combustion solid fuel burning appliance is installed with combustion air in accordance with the manufacturer's installation instructions, additional makeup air is not required.

4. When an exhaust system with a rated capacity greater than 300 cfm (0.144 m³/s) is installed in a dwelling constructed during or after 1994 under the Minnesota Energy Code, Minnesota Rules, chapter 7670, makeup air quantity shall be determined by using IMC Table 501.3.3(1) and shall be supplied according to IMC Section 501.3.2.

Exception: If powered makeup air is electrically interlocked and matched to the airflow of the exhaust system additional makeup air is not required.

5. When an exhaust system with a rated capacity greater than 300 cfm (0.144 m³/s) is installed in a dwelling constructed prior to 1994, makeup air quantity shall be determined by using IMC Table 501.3.3(2) and shall be supplied according to IMC Section 501.3.2.

Exception: If powered makeup air is electrically interlocked and matched to the airflow of the exhaust system, additional makeup air is not required.

6. When a solid fuel appliance is installed in a dwelling constructed prior to 1994, makeup air quantity shall be determined by using IMC Table 501.3.3(3) and shall be supplied according to IMC Section 501.3.2.

Exception: If a closed combustion solid fuel burning appliance is installed with combustion air in accordance with the manufacturer's installation instructions, additional makeup air is not required.

Exception: Makeup air is not required in Items 1 to 6 when any of the following are demonstrated:

1. A test is performed according to ASTM Standard E1998-02 ( 2007), Standard Guide for Assessing Depressurization-Induced Backdrafting and Spillage from Vented Combustion Appliances, and documentation is provided that the vented combustion appliances continue to operate within established parameters of the test.

2. A test approved by the building official verifies proper operation of vented combustion appliances.

Table 501.3.1

Procedure to Determine Makeup Air Quantity for Exhaust Equipment in Dwellings

	One or multiple power vent or direct vent appliances or no combustion appliancesA		One or multiple fan-assisted appliances and power vent or direct vent appliancesB		One atmospherically vented gas or oil appliance or one solid fuel applianceC		Multiple atmospherically vented gas or oil appliances or solid fuel appliancesD
1. Use the Appropriate Column to Estimate House Infiltration
a) pressure factor (cfm/sf)	0.15		0.09		0.06		0.03
b) conditioned floor area (sf)	_		_		_		_
(including unfinished basements)
Estimated House Infiltration (cfm): [1a x 1b]	_		_		_		_
2. Exhaust Capacity
a) continuous exhaust-only ventilation system (cfm):	_		_		_		_
(not applicable to balanced ventilation systems such as HRV)
b) clothes dryer	135		135		135		135
c) 80% of largest exhaust rating (cfm):	_		_		_		_
(not applicable if recirculating system or if powered makeup air is electrically interlocked and matched to exhaust)
d) 80% of next largest exhaust rating (cfm):	not applicable		_		_		_
(not applicable if recirculating system or if powered makeup air is electrically interlocked and matched to exhaust)
Total Exhaust Capacity (cfm): [2a+2b+2c+2d]	_		_		_		_
3. Makeup Air Requirement
a) Total Exhaust Capacity (from above)	_		_		_		_
b) Estimated House Infiltration (from above)	_		_		_		_
Makeup Air Quantity (cfm): [3a - 3b]	_		_		_		_
(if value is negative, no makeup air is needed)

4. For Makeup Air Opening Sizing, refer to Table 501.3.2

^AUse this column if there are other than fan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances.

^BUse this column if there is one fan-assisted appliance per venting system. Other than atmospherically vented appliances may also be included.

^CUse this column if there is one atmospherically vented (other than fan-assisted) gas or oil appliance per venting system or one solid fuel appliance.

^DUse this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil appliances and solid fuel appliances.

Table 501.3.2

Makeup Air Opening Sizing Table for New and Existing Dwellings

	One or multiple power vent or direct vent appliances or no combustion appliancesA	One or multiple fan-assisted appliances and power vent or direct vent appliancesB	One atmospher- ically vented gas or oil appliance or one solid fuel applianceC	Multiple atmospher- ically vented gas or oil appliances or solid fuel appliancesD	Passive makeup air opening duct diameterE,F,G
Type of opening or system	(cfm)	(cfm)	(cfm)	(cfm)	(inches)
Passive Opening	1-36	1-22	1-15	1-9	3
Passive Opening	37-66	23-41	16-28	10-17	4
Passive Opening	67-109	42-66	29-46	18-28	5
Passive Opening	110-163	67-100	47-69	29-42	6
Passive Opening	164-232	101-143	70-99	43-61	7
Passive Opening	233-317	144-195	100-135	62-83	8
Passive Opening with Motorized Damper	318-419	196-258	136-179	84-110	9
Passive Opening with Motorized Damper	420-539	259-332	180-230	111-142	10
Passive Opening with Motorized Damper	540-679	333-419	231-290	143-179	11
Powered Makeup AirH	>679	>419	>290	>179	Not Applicable

^AUse this column if there are other than fan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances.

^BUse this column if there is one fan-assisted appliance per venting system. Other than atmospherically vented appliances may also be included.

^CUse this column if there is one atmospherically vented (other than fan-assisted) gas or oil appliance per venting system or one solid fuel appliance.

^DUse this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil appliances and solid fuel appliance(s).

^EAn equivalent length of 100 feet of round smooth metal duct is assumed. Subtract 40 feet for the exterior hood and ten feet for each 90-degree elbow to determine the remaining length of straight duct allowable.

^FIf flexible duct is used, increase the duct diameter by one inch. Flexible duct shall be stretched with minimal sags.

^GBarometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance is installed.

^HPowered makeup air shall be electrically interlocked with the largest exhaust system.

Table 501.3.3(1)

Procedure to Determine Makeup Air Quantity for Exhaust Equipment in Existing Dwellings

(Refer to Item 4 in Section 501.3.3 to determine applicability of this table)

	One or multiple power vent or direct vent appliances or no combustion appliancesA		One or multiple fan-assisted appliances and power vent or direct vent appliancesB		One atmospherically vented gas or oil appliance or one solid fuel applianceC		Multiple atmospherically vented gas or oil appliances or solid fuel appliancesD
1. Use the Appropriate Column to Estimate House Infiltration
a) pressure factor (cfm/sf)	0.15		0.09		0.06		0.03
b) conditioned floor area (sf)	_		_		_		_
Estimated House Infiltration (cfm): [1a x 1b]	_		_		_		_
2. Exhaust Capacity
80% of exhaust rating = Exhaust Capacity (cfm):	_		_		_		_
(not applicable if recirculating system or if powered makeup air is electrically interlocked and matched to exhaust)
3. Makeup Air Requirement
a) Exhaust Capacity (from above)	_		_		_		_
b) Estimated House Infiltration (from above)	_		_		_		_
Makeup Air Quantity (cfm): [3a - 3b]	_		_		_		_
(if value is negative, no makeup air is needed)

4. For Makeup Air Opening Sizing, refer to Table 501.3.2

^AUse this column if there are other than fan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances.

^BUse this column if there is one fan-assisted appliance per venting system. Other than atmospherically vented appliances may also be included.

^CUse this column if there is one atmospherically vented (other than fan-assisted) gas or oil appliance per venting system or one solid fuel appliance.

^DUse this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil appliances and solid fuel appliances.

Table 501.3.3(2)

Procedure to Determine Makeup Air Quantity for Exhaust Equipment in Existing Dwellings

(Refer to Item 5 in Section 501.3.3 to determine applicability of this table)

	One or multiple power vent or direct vent appliances or no combustion appliancesA		One or multiple fan-assisted appliances and power vent or direct vent appliancesB		One atmospherically vented gas or oil appliance or one solid fuel applianceC		Multiple atmospherically vented gas or oil appliances or solid fuel appliancesD
1. Use the Appropriate Column to Estimate House Infiltration
a) pressure factor (cfm/sf)	0.25		0.15		0.10		0.05
b) conditioned floor area (sf)	_		_		_		_
(including unfinished basements)
Estimated House Infiltration (cfm): [1a x 1b]	_		_		_		_
or Alternative Calculation (by using blower door test)E
c) conversion factor	0.75		0.45		0.30		0.15
d) CFM50 value (from blower door test)	_		_		_		_
Estimated House Infiltration (cfm): [1c x 1d]	_		_		_		_
2. Exhaust Capacity
80% of exhaust rating = Exhaust Capacity (cfm):	_		_		_		_
(not applicable if recirculating system or if powered makeup air is electrically interlocked with exhaust)
3. Makeup Air Requirement
a) Exhaust Capacity (from above)	_		_		_		_
b) Estimated House Infiltration (from above)	_		_		_		_
Makeup Air Quantity (cfm): [3a - 3b]	_		_		_		_
(if value is negative, no makeup air is needed)

4. For Makeup Air Opening Sizing, refer to Table 501.3.2

^AUse this column if there are other than fan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances.

^BUse this column if there is one fan-assisted appliance per venting system. Other than atmospherically vented appliances may also be included.

^CUse this column if there is one atmospherically vented (other than fan-assisted) gas or oil appliance per venting system or one solid fuel appliance.

^DUse this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil appliances and solid fuel appliances.

^EAs an alternative, the Estimated House Infiltration may be calculated by performing a blower door test and multiplying the conversion factor by the CFM50 value.

Table 501.3.3(3)

Procedure to Determine Makeup Air Quantity for Exhaust Equipment in Existing Dwellings

(Refer to Item 6 in Section 501.3.3 to determine applicability of this table)

	One or multiple power vent or direct vent appliances or no combustion appliancesA		One or multiple fan-assisted appliances and power vent or direct vent appliancesB		One atmospherically vented gas or oil appliance or one solid fuel applianceC		Multiple atmospherically vented gas or oil appliances or solid fuel appliancesD
1. Use the Appropriate Column to Estimate House Infiltration
a) pressure factor (cfm/sf)	0.25		0.15		0.10		0.05
b) conditioned floor area (sf)	_		_		_		_
(including unfinished basements)
Estimated House Infiltration (cfm): [1a x 1b]	_		_		_		_
or Alternative Calculation (by using blower door test)E
c) conversion factor	0.75		0.45		0.30		0.15
d) CFM50 value (from blower door test)	_		_		_		_
Estimated House Infiltration (cfm): [1c x 1d]	_		_		_		_
2. Exhaust Capacity
a) continuous exhaust-only ventilation system (cfm)	_		_		_		_
(not applicable to balanced ventilation systems)
b) clothes dryer (cfm)	135		135		135		135
c) 80% of largest exhaust rating (cfm):	_		_		_		_
(not applicable if recirculating system or if powered makeup air is electrically interlocked and with exhaust)
d) 80% of next largest exhaust rating (cfm)	Not applicable		_		_		_
(not applicable if recirculating system or if powered makeup air is electrically interlocked with exhaust)
Total Exhaust Capacity (cfm): [2a+2b+2c+2d]	_		_		_		_
3. Makeup Air Requirement
a) Total Exhaust Capacity (from above)	_		_		_		_
b) Estimated House Infiltration (from above)	_		_		_		_
Makeup Air Quantity (cfm): [3a - 3b]	_		_		_		_
(if value is negative, no makeup air is needed)

4. For Makeup Air Opening Sizing, refer to Table 501.3.2

^AUse this column if there are other than fan-assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances.

^BUse this column if there is one fan-assisted appliance per venting system. Other than atmospherically vented appliances may also be included.

^CUse this column if there is one atmospherically vented (other than fan-assisted) gas or oil appliance per venting system or one solid fuel appliance.

^DUse this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil appliances and solid fuel appliances.

^EAs an alternative, the Estimated House Infiltration may be calculated by performing a blower door test and multiplying the conversion factor by the CFM50 value.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 1 s 1; 34 SR 537

Published Electronically:

October 23, 2009

1346.0504 SECTION 504 CLOTHES DRYER EXHAUST.

IMC Section 504.1 is amended to read as follows:

504.1 Installation. Clothes dryers shall be exhausted in accordance with the manufacturer's instructions. Dryer exhaust systems shall be independent of all other systems and shall convey the moisture and any products of combustion to the outside of the building.

Exception: This section shall not apply to listed and labeled condensing (ductless) clothes dryers. The room where a listed and labeled condensing (ductless) clothes dryer is installed shall be provided with an exhaust ventilation system of 70 cfm or greater and shall have a floor drain or other approved plumbing fixture or disposal area for condensate.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.0505 SECTION 505 DOMESTIC KITCHEN EXHAUST EQUIPMENT.

IMC Section 505.1 is amended to read as follows:

505.1 Domestic systems. Where domestic range hoods and domestic appliances equipped with downdraft exhaust are located within dwellings, the hoods and appliances shall discharge to the outdoors through ducts constructed of galvanized steel, stainless steel, aluminum, or copper. The ducts shall have smooth inner walls and shall be air tight and equipped with a backdraft damper. Domestic kitchen exhaust hoods ducted to the outdoors shall have makeup air provided according to part 1346.0501. Refer to Appendix C for Table C-1, "Recommended Capacities for Domestic Kitchen Exhaust Hoods."

Exceptions:

1. Where installed according to the manufacturer's installation instructions and where mechanical or natural ventilation is otherwise provided according to IMC Chapter 4, listed and labeled ductless range hoods shall not be required to discharge to the outdoors.

2. Ducts for domestic kitchen cooking appliances equipped with downdraft exhaust systems shall be permitted to be constructed of Schedule 40 PVC pipe provided that the installation complies with all of the following:

2.1. The duct shall be installed under a concrete slab poured on grade.

2.2. The underfloor trench in which the duct is installed shall be completely backfilled with sand or gravel.

2.3. The PVC duct shall extend not greater than 1 inch (25 mm) above the indoor concrete floor surface.

2.4. The PVC duct shall extend not greater than 1 inch (25 mm) above grade outside of the building.

2.5. The PVC ducts shall be primed and solvent cemented in accordance with ASTM D2564.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0506 SECTION 506 COMMERCIAL KITCHEN HOOD VENTILATION SYSTEM DUCTS AND EXHAUST EQUIPMENT.

Subpart 1.

Section 506.3.

IMC Section 506.3 is amended to read as follows:

506.3 Ducts serving Type I hoods. Commercial kitchen exhaust systems serving Type I hoods shall be designed, constructed and installed in accordance with NFPA 96-2008, Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations.

Subp. 2.

Sections 506.3.1 to 506. 3.12.3.

IMC Sections 506.3.1 to 506.3.12.3 are deleted and replaced with NFPA 96-2008, sections 5.1.1 and 7.5.2, with the following amendments:

5.1.1 The hood or that portion of a primary collection means designed for collecting cooking vapors and residues shall be constructed of stainless steel not less than 0.94 mm (0.037 in.) (No. 20 MSG) in thickness or other approved material of equivalent strength and fire and corrosion resistance. Refer to the Minnesota Food Code, Minnesota Rules, chapter 4626, for additional requirements for commercial kitchen hoods licensed and inspected by the Department of Agriculture, Department of Health, or local authorities that conduct inspections of food establishments.

7.5.2.1 All seams, joints, penetrations, and duct-to-hood collar connections shall have a liquid tight continuous external weld. Listed grease ducts and ducts complying with 7.5.1 through 7.5.5.5 that are installed within a concealed enclosure shall maintain an air pressure test of at least 1.0 inch water column positive pressure for a minimum of 20 minutes, unless an equivalent alternate test is specified by the building official.

Subp. 3.

Section 506.4.2.

IMC Section 506.4.2 is amended to read as follows:

506.4.2 Ducts. Ducts and plenums serving Type II hoods shall be constructed of rigid metallic materials. Duct construction, installation, bracing, and supports shall comply with IMC Chapter 6. Ducts conveying moisture-laden or waste heat-laden air shall comply with the following requirements:

1. Ducts shall be constructed, joined, and sealed to prevent drips and leaking.

2. Ducts shall slope not less than one-fourth unit vertical in 12 units horizontal (2 percent slope) toward the hood or toward an approved reservoir.

3. Horizontal ducts exceeding 75 feet (22,860 mm) in length shall slope not less than one unit vertical in 12 units horizontal (8.3 percent slope).

4. Ducts subject to positive pressure shall maintain an air pressure test of 1.0 inch water column positive pressure for a minimum of 20 minutes, unless an equivalent alternate test is specified by the building official.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0507 SECTION 507 COMMERCIAL KITCHEN HOODS.

Subpart 1.

Section 507.1.

IMC Section 507.1 is amended by adding subsection 507.1.1 after the exceptions to read as follows:

507.1.1 Factory built systems with exhaust or recovery. Where factory built commercial cooking recirculating systems or dishwashers and potwashers equipped with heat and vapor exhaust or recovery systems are installed, the sensible and latent heat from the systems shall be included in the HVAC design calculations of the kitchen. A mechanical HVAC system shall be provided to maintain maximum relative humidity of 65 percent in the space.

Subp. 2.

Section 507.2.

IMC Section 507.2 is amended to read as follows:

507.2 Where required. A Type I or Type II hood shall be installed at or above all commercial cooking appliances in accordance with Sections 507.2.1 and 507.2.2. Where any cooking appliance under a single hood requires a Type I hood, a Type I hood shall be installed. Where a Type II hood is required, a Type I or Type II hood shall be installed.

507.2.1 Type I hoods. Type I hoods shall be installed where cooking appliances produce grease or smoke, such as occurs with griddles, fryers, broilers, ovens, ranges, and wok ranges.

507.2.1.1 Operation. Type I hood systems shall be designed and installed to automatically activate the exhaust fan whenever cooking operations occur. The activation of the exhaust fan shall occur through an interlock with the cooking appliances, by means of heat sensors or by means of other approved methods.

507.2.2 Type II hoods. Type II hoods shall be installed where cooking or dishwashing appliances produce heat, steam, or products of combustion and do not produce grease or smoke, such as steamers, kettles, pasta cookers, and dishwashing machines.

Exceptions:

1. Under-counter-type commercial dishwashing machines.

2. A Type II hood is not required for dishwashers and potwashers that are provided with heat and water vapor exhaust or recovery systems that are supplied by the appliance manufacturer and are installed in accordance with the manufacturer's instructions. The additional heat and moisture loads generated by such appliances shall be accounted for in the design of the HVAC system. The HVAC system shall maintain a maximum relative humidity of 65 percent in the space.

3. A single light-duty electric convection, bread, retherm, or microwave oven that are rated at 3.7 kW or less. The additional heat and moisture loads generated by such appliances shall be accounted for in the design of the HVAC system. The HVAC system shall maintain a maximum relative humidity of 65 percent in the space.

4. A Type II hood is not required for the following electrically heated appliances: toasters, steam tables, popcorn poppers, hot dog cookers, coffee makers, rice cookers, egg cookers, and holding/warming ovens that are rated at 3.7 kW or less. The additional heat and moisture loads generated by such appliances shall be accounted for in the design of the HVAC system. The HVAC system shall maintain a maximum relative humidity of 65 percent in the space.

Subp. 3.

[Repealed, 34 SR 537]

Subp. 4.

Section 507.2.3.

IMC Section 507.2.3 is amended to read as follows:

507.2.3 Domestic cooking appliances used for commercial purposes. Domestic cooking appliances utilized for commercial purposes shall be provided with Type I or II hoods as required for the type of appliances and processes in accordance with amended IMC Section 507.2. Refer to the Minnesota Food Code, Minnesota Rules, chapter 4626, for additional requirements for commercial kitchen hoods licensed and inspected by the Department of Agriculture, Department of Health, or local authorities that conduct inspections of food establishments.

Subp. 5.

[Repealed, 34 SR 537]

Subp. 6.

Section 507.4.

IMC Section 507.4 is deleted.

Subp. 7.

Section 507.5.

IMC Section 507.5 is amended to read as follows:

507.5 Type II hood materials. Type II hood materials shall be constructed of stainless steel not less than 0.024 inch (0.61 mm) (No. 24 Gage) in thickness, copper sheets weighing not less than 24 ounces per square foot (7.3 kg/m²), or of other approved material and gage. Refer to the Minnesota Food Code, Minnesota Rules, chapter 4626, for additional requirements for commercial kitchen hoods licensed and inspected by the Department of Agriculture, Department of Health, or local authorities that conduct inspections of food establishments.

Subp. 8.

Section 507.7.

IMC Section 507.7 is amended to read as follows:

507.7 Hood joints, seams, and penetrations. Hood joints, seams, and penetrations shall comply with amended IMC Section 507.7.1 and IMC Section 507.7.2.

Subp. 9.

Section 507.7.1.

IMC Section 507.7.1 is amended to read as follows:

507.7.1 Type I hoods. Type I hoods shall be designed, constructed, and installed in accordance with Chapter 5 of NFPA 96-2008.

Subp. 10.

Sections 507.8 to 507.11.2.

IMC Sections 507.8 through 507.11.2 are deleted.

Subp. 11.

[Repealed, 34 SR 537]

Subp. 12.

Section 507.14.

IMC Section 507.14 is deleted.

Subp. 13.

[Repealed, 34 SR 537]

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0508 SECTION 508 COMMERCIAL KITCHEN MAKEUP AIR.

Subpart 1.

Section 508.1.

IMC Section 508.1 is amended to read as follows:

508.1 Makeup air. Makeup air shall be supplied during the operation of commercial kitchen exhaust systems that are provided for commercial food heat-processing appliances. The amount of makeup air supplied shall be approximately equal to the exhaust air. A minimum of 80 percent of the makeup air shall be supplied into the space where the exhaust hood is located. The makeup air shall not reduce the effectiveness of the exhaust system. Makeup air shall be provided by mechanical means and the exhaust and makeup air systems shall be electrically interlocked to insure that makeup air is provided whenever the exhaust system is in operation. Makeup air intake openings shall comply with IMC Section 401.4 and amended IMC Section 401.4.1.

Exception: This section shall not apply to dwelling units.

508.1.1 Makeup air temperature. Makeup air shall be not less than 50°F (10°C), measured at the flow of air from the supply diffuser into the space.

508.1.2 Makeup and ventilation air distribution. Makeup and ventilation air supply diffusers located within 12 feet (3.7 m) of an exhaust hood shall be directed away from the hood.

Exception: Perimeter perforated supply plenums installed in accordance with the manufacturer's installation instructions.

Subp. 2.

Section 508.2.

IMC Section 508.2 is amended to read as follows:

508.2 Compensating hoods. Manufacturers of compensating hoods shall provide a label indicating minimum exhaust flow and maximum makeup airflow that provides capture and containment of the exhaust effluent. Short-circuit compensating hoods are prohibited.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0510 SECTION 510 HAZARDOUS EXHAUST SYSTEMS.

Subpart 1.

Section 510.1.

IMC Section 510.1 is amended by adding an exception to the end of this section as follows:

Exception: Other than sections 510.4 and 510.7, this section shall not apply to laboratory ventilation systems that comply with NFPA 45-2004.

Subp. 2.

[Repealed, 34 SR 537]

Subp. 3.

[Repealed, 34 SR 537]

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0601 SECTION 601 GENERAL.

IMC Section 601.1 is amended to read as follows:

601.1 Scope. Duct systems used for the movement of air in air-conditioning, heating, ventilating, and exhaust systems shall conform to the provisions of this chapter except as otherwise specified in chapters 5 and 7.

Exception: Linen chutes, trash chutes, and ducts discharging combustible material directly into any combustion chamber, shall conform to the requirements of NFPA 82. Chutes shall not be required to be open to the atmosphere, as required by NFPA 82, section 5.2.2.4.3.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.0602 SECTION 602 PLENUMS.

IMC Section 602.2.1 is amended by adding a subsection to read as follows:

Section 602.2.1.7. Piping in Plenums. Piping carrying flammable or combustible gases or liquids in a plenum must have all connections made by welding or brazing. No flanges, valves, threaded fittings, unions, or connectors are permitted.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.0603 SECTION 603 DUCT CONSTRUCTION AND INSTALLATION.

Subpart 1.

[Repealed, 34 SR 537]

Subp. 2.

Section 603.4.

IMC Section 603.4 is amended to read as follows:

603.4 Metallic ducts. All metallic ducts shall be constructed as specified in the SMACNA HVAC Duct Construction Standards - Metal and Flexible.

Exception: Ducts installed within a single dwelling unit shall have a minimum thickness as specified in Table 603.4.

603.4.1 Elbows. Radius elbows with velocities exceeding 1,000 feet per minute (fpm) (76.2 m/min) shall have an inside radius not less than the width of the duct or shall have turning vanes. Square throat elbows with velocities exceeding 1,000 feet per minute (fpm) (76.2 m/min) shall have turning vanes.

Exception: Ducts installed within a single dwelling unit.

603.4.2 Transition fittings. Transition fittings shall be constructed with a maximum slope of 45 degrees.

603.4.3 Obstructions. Where a pipe or other obstruction passes through a duct, a streamlined sleeve must be constructed equal in type and gage to the duct. The area of the duct, at the point of obstruction, must be increased by an amount equal to the area of the streamlined sleeve.

Subp. 3.

Section 603.7.

IMC Section 603.7 is amended to read as follows:

603.7 Rigid duct penetrations. Duct system penetrations of walls, floors, ceilings, and roofs and air transfer openings in any of those building components shall be protected as required by IMC Section 607. Ducts in a private garage and ducts penetrating the walls or ceilings separating a dwelling from a private garage shall be continuous and constructed of minimum 26 gage (0.48 mm) galvanized sheet metal and shall have no openings into the garage. Fire and smoke dampers are not required in such ducts passing through the wall or ceiling separating a dwelling from a private garage, unless required by International Building Code Chapter 7.

Subp. 4.

Section 603.8.

IMC Section 603.8 is amended to read as follows:

603.8 Underground ducts. Ducts shall be approved for underground installation. Metallic ducts not having an approved protective coating shall be completely encased in a minimum of 2 inches (51 mm) of concrete.

Subp. 5.

Section 603.8.1.

IMC Section 603.8.1 is amended to read as follows:

603.8.1 Slope. Ducts shall slope to allow drainage to a point provided with access for inspection and cleaning at each low point of the duct system.

Subp. 6.

Section 603.8.2.

IMC Section 603.8.2 is amended to read as follows:

603.8.2 Sealing. Ducts shall have a polyethylene vapor retarder of at least 4 mils (0.102 mm) thickness installed around the outside. Where encased in concrete, the ducts shall be sealed and secured prior to pouring the concrete encasement.

Subp. 7.

Section 603.8.3.

IMC Section 603.8.3 is amended to read as follows:

603.8.3 Plastic ducts and fittings. Plastic ducts shall be constructed of PVC or high-density polyethylene having a minimum pipe stiffness of 8 psi (55 kPa) at 5-percent deflection when tested in accordance with ASTM D2412. Plastic duct fittings shall be constructed of either PVC or high-density polyethylene. Plastic duct and fittings shall be utilized in underground installations only. The maximum design temperature for systems utilizing plastic duct and fittings shall be 150°F (66°C).

Subp. 8.

Section 603.8.

IMC Section 603.8 is amended by adding a subsection to read as follows:

603.8.4 Drainage and insulation.

Underground ducts shall be insulated in accordance with amended IMC Section 604.1 and provided with drain tile around the perimeter of the duct system to prevent water intrusion. The top of the drain tile shall be installed at an elevation lower than the bottom of the underground duct system. The building official may approve an alternate drainage system if soil conditions are adequate.

Subp. 9.

Section 603.9.

IMC Section 603.9 is amended to read as follows:

603.9 Joints, seams, and connections. Pressure sensitive tape shall not be used as the primary sealant for ducts designed to operate at static pressure of one inch water gauge or greater.

Duct Sealing
Location	Design Static Pressure	Minimum Required Sealing
All locations	Greater than 3.0 inches (750 Pa) water gauge	All transverse joints, longitudinal seams, and duct wall penetrations shall be sealed. Ductwork shall be equal to or less than Leakage Class 6 as defined in Section 4 of the SMACNA HVAC Duct Leakage Test Manual*.
Portions of ducts not completely inside the vapor retarder/air barrier enclosing conditioned space	3.0 inches (750 Pa) water gauge and less	All transverse joints, longitudinal seams, and duct wall penetrations shall be sealed.
Portions of return air ducts in the same space as an atmospherically vented or fan-assisted appliance.	3.0 inches (750 Pa) water gauge and less	All transverse joints, longitudinal seams, and duct wall penetrations shall be sealed.
All locations	Greater than 0.50 to 3.0 inches (125 to 750 Pa) water gauge	All transverse joints and duct wall penetrations shall be sealed.
All locations	0.50 inches (125 Pa) water gauge and less	All transverse joints, longitudinal seams, and duct wall penetrations shall have no visible gaps and shall be sufficiently airtight in accordance with Section 1.7 of the SMACNA HVAC Duct Construction Standards - Metal & Flexible

^*Representative sections totaling no less than 25 percent of the total installed duct area for the designated pressure class shall be tested. Duct systems with pressure ratings in excess of three inches water column shall be identified in the construction documents.

Subp. 10.

Section 603.17.

IMC Section 603.17 is amended by adding a subsection to read as follows:

603.17.3 Adjustment of volume dampers. Volume dampers shall be adjusted to the required airflow of the system and locked in place. In finished or inaccessible locations, a friction-type register box may be used.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

15 SR 71; 29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0604 SECTION 604 INSULATION.

IMC Section 604.1 is amended to read as follows:

604.1 General. Duct insulation shall conform to the thickness required by this section and Sections 604.2 through 604.13.

Exception: Except as required to prevent condensation, ducts for which heat gain or loss, without insulation, will not increase the energy requirements of the building.

Minimum Required Duct Insulation (see notes for explanations)

Duct Location	Requirements
Attics, garages, and ventilated crawl spaces	R-8 and V
Exterior of building	R-8, V and W
Inside of building and in unconditioned spaces
TD less than or equal to 15°F	None required
TD greater than 15°F and less than or equal to 40°F	R-3.3 and V
TD greater than 40°F	R-5 and V
Within conditioned spaces, in basements with insulated walls, and in plenums within conditioned spaces	None required
Intake and exhaust ducts within conditioned spaces*	R-3.3 and V
Within cement slab or within ground (also see IMC Section 603.7)	R-3.5

Notes:

^*Insulation required for a distance of 3 feet (914 mm) from the exterior.

TD = Design temperature differential between the air in the duct and the ambient temperature outside of the duct.

V = Vapor retarder required in accordance with IMC Section 604.11. When a vapor retarder is required, duct insulation required by this section shall be installed without respect to other building envelope insulation.

W = Approved weatherproof barrier.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

15 SR 71; 29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0605

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0606

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0607

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0608

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0701 SECTION 701 GENERAL.

Subpart 1.

Section 701.4.

IMC Section 701.4 is amended to read as follows:

701.4 Engineered installations. Engineered combustion air installations shall provide adequate supply of combustion, ventilation, and dilution air, and shall be approved by the building official.

Subp. 2.

Sections 701.4.1 and 701.4.2.

IMC Sections 701.4.1 and 701.4.2 are deleted.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0703 SECTION 703 OUTDOOR AIR.

IMC Sections 703.1 through 703.1.2.2 are amended to read as follows:

703.1 All air from the outdoors. Where all combustion and dilution air is to be provided by outdoor air, the required combustion and dilution air shall be obtained by opening the room to the outdoors. Openings connecting the room to the outdoor air shall comply with IMC Sections 703.1.1 through 703.1.2.2.

703.1.1 One permanent opening method. When any natural draft equipment is installed, one permanent opening, commencing within 12 inches (300 mm) of the bottom of the enclosure, shall be provided. When other than natural draft equipment is installed, one permanent opening, commencing within 12 inches (300 mm) of the top of the enclosure, shall be provided. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces that freely communicate with the outdoors and shall have a minimum free area of 1 inch²/3,000 Btu/hr (700 mm²/kW/hr) of the total input rating of all equipment located in the enclosure.

703.1.2 Two permanent openings method. Two openings shall be provided, one within 1 foot (305 mm) of the ceiling of the room and one within 1 foot (305 mm) of the floor.

703.1.2.1 Size of horizontal openings. The net free area of each opening, calculated in accordance with IMC Chapter 709 and connected to the outdoors through a horizontal duct, shall be a minimum of 1 square inch per 2,000 Btu/h (1,100 mm²/kW) of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.

703.1.2.2 Size of vertical openings. The net free area of each opening, calculated in accordance with IMC Chapter 709 and connected to the outdoors through a vertical duct, shall be a minimum of 1 square inch per 4,000 Btu/h (550 mm²/kW) of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0706

[Repealed, 19 SR 1306]

Published Electronically:

October 23, 2009

1346.0707

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0709

[Repealed, 34 SR 537]

Published Electronically:

October 23, 2009

1346.0710

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0801 SECTION 801 GENERAL.

Subpart 1.

Section 801.10.

IMC Section 801.10 is amended to read as follows:

801.10 Connection to fireplace. Connection of appliances to chimney flues serving fireplaces is prohibited. Refer to IFGC Section 602 for Decorative Appliances for Installation in Fireplaces and IFGC Section 603 for Log Lighters.

Subp. 2.

[Repealed, 34 SR 537]

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.0803 SECTION 803 CONNECTORS.

IMC Section 803 is amended to read as follows:

803.10.1 Supports and joints. Connectors shall be supported in an approved manner, and joints shall be fastened with a minimum of three equally spaced sheet metal screws, rivets, or other approved means.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0807

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0808

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0809

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.0901 SECTION 901 GENERAL.

IMC Section 901 is amended by adding a section to read as follows:

901.5 Unvented heaters and appliances. Unvented room heaters, unvented infrared heaters, and unvented decorative appliances shall not be installed in any dwelling or occupancy.

Exception: Unvented infrared heaters may be installed when mechanical ventilation is provided to exhaust at least 4 cubic feet per minute (cfm) (0.0203 m³/s) per 1000 Btu/hr (0.292 kW) input and it is electrically interlocked with the heater. Makeup air shall be provided to the space to be heated.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.0906

[Repealed, 19 SR 1306]

Published Electronically:

October 23, 2009

1346.0913

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1001 SECTION 1001 GENERAL.

Subpart 1.

Department of Labor and Industry boilers.

Pursuant to chapter 5225 and Minnesota Statutes, sections 326B.952 to 326B.998, the installation, inspection, alteration, and repair of pressure vessels and individual boilers or boilers connected to a common circulation manifold shall be regulated by the Department of Labor and Industry if the individual or combined BTU input exceeds:

A.

100,000 BTUs for steam boilers;

B.

500,000 BTUs for hot water supply boilers; or

C.

750,000 BTUs for hot water heating boilers.

Exceptions:

1. Boilers in buildings occupied solely for residential purposes with accommodations for not more than five families.

2. Any boiler or pressure vessel under the direct jurisdiction of the United States.

3. Boiler or pressure vessels located on farms used solely for agricultural or horticultural purposes; for the purposes of this section, boilers used for mint oil extraction are considered used for agricultural or horticultural purposes, provided that the owner or lessee complies with the inspection requirements contained in Minnesota Statutes, section 326B.958.

Subp. 2.

High pressure piping for boilers.

Pursuant to chapter 5230 and Minnesota Statutes, sections 326B.90 to 326B.925, high pressure piping for boilers shall be regulated by the Department of Labor and Industry for the following operating conditions:

A.

Steam systems operating over 15 psi; or

B.

Hot water or other heating medium operating over 30 psi and 250° F.

Subp. 3.

IMC Section 1001.

IMC Section 1001.1 is amended to read as follows:

1001.1 Scope. This rule shall govern system piping with pressures of 15 psi or less, boilers, water heaters, heat exchangers, and pressure vessels that are not regulated by the Department of Labor and Industry's Boiler and High Pressure Piping Sections.

Exceptions:

1. Pressure vessels used for unheated water supply.

2. Portable unfired pressure vessels and Interstate Commerce Commission containers.

3. Containers for bulk oxygen and medical gas.

4. Unfired pressure vessels having a volume of 5 cubic feet (0.14 m³) or less operating at pressures not exceeding 100 pounds per square inch (psi) (1724 kPa) that are equipped with an ASME code stamped safety valve set at a maximum of 100 pounds per square inch and located within occupancies of Groups B, F, H, M, R, S and U.

5. Pressure vessels used in refrigeration systems that are regulated by Chapter 11 of this code.

6. Pressure tanks used in conjunction with coaxial cables, telephone cables, power cables, and other similar humidity control systems.

7. Any boiler or pressure vessel under the direct jurisdiction of the United States.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 9 s 27; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.1002

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1003 SECTION 1003 PRESSURE VESSELS.

IMC Section 1003.3 is amended to read as follows:

1003.3 Welding. Welding on boilers and pressure vessels shall be performed by approved welders in compliance with the ASME Boiler and Pressure Vessel Code Section IX and the National Board Inspection Code.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1004 SECTION 1004 BOILERS.

Subpart 1.

Section 1004.1.

IMC Section 1004.1 is amended to read as follows:

1004.1 Standards. Oil-fired boilers and their control systems shall be listed and labeled in accordance with UL 726 or shall utilize burner assemblies and control systems listed and labeled in accordance with UL 296 and shall be installed in accordance with NFPA 31 and the manufacturer's installation instructions. Electric boilers and their control systems shall be listed and labeled in accordance with UL 834. Boilers with an input rating above 400,000 Btu/hr (3,660 kW) shall be designed and constructed in accordance with the requirements of the BPVC-2007 ASME Boiler and Pressure Vessel Code, Sections I, II, IV, V, VIII and IX, as applicable. Boilers with an input rating above 400,000 Btu/hr (117 kW) and less than 12,500,000 Btu/hr (3,660 kW) shall comply with ASME CSD-1-2006, and boilers with an input rating of 12,500,000 Btu/hr (3,660 kW) or greater shall comply with NFPA 85-2007, Boiler and Combustion Systems Hazards Code.

Subp. 2.

Section 1004.2.

IMC Section 1004.2 is amended to read as follows:

1004.2 Installation. In addition to the requirements of this code, the installation of boilers shall conform to the manufacturer's instructions. Operating instructions of a permanent type shall be attached to the boiler. Boilers shall have all controls set, adjusted, and tested by the installer in accordance with amended IMC Chapter 16. A complete control diagram together with complete boiler instructions shall be furnished by the installer. The manufacturer's rating data and the nameplate shall be attached to the boiler.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

19 SR 1306; 29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.1005

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1006 SECTION 1006 SAFETY AND PRESSURE RELIEF VALVES AND CONTROLS.

Subpart 1.

Section 1006.4.

IMC Section 1006.4 is amended to read as follows:

1006.4 Approval of safety and safety relief valves. Safety and safety relief valves shall meet the requirements of Section I, IV or VIII of the ASME Boiler and Pressure Vessel Code, as applicable. All boilers and pressure vessels shall have a safety relief valve stamped with the ASME code symbol and shall be set no higher than the maximum allowable working pressure of the pressure vessel. Safety relief valves shall have a rated volumetric capacity greater than the boiler or pressure vessel can produce at nameplate pressure and shall have a nonadjustable pressure set point below the rating of the boiler or pressure vessel capable of relieving all excess pressure at its pressure set point. Safety and safety relief valves shall have a manual method of lifting the seat, without endangering the operator, to ensure proper mechanical operation.

Subp. 2.

Section 1006.6.

IMC Section 1006.6 is amended to read as follows:

1006.6 Safety and relief valve discharge. Safety and relief valve discharge pipes shall be of rigid pipe that is approved for the temperature and pressure of the system. The discharge pipe shall be no smaller than the diameter of the safety or relief valve outlet and the discharge end shall be reamed and unthreaded. Safety and relief valves shall not discharge so as to be a hazard, a potential cause of damage, or otherwise a nuisance and shall terminate within 18 inches of the floor. High-pressure steam safety valves shall be vented to the outside of the structure in accordance with Minnesota Rules, parts 5225.4100 and 5230.0990 on boilers, pressure vessels, and high-pressure piping under the jurisdiction of the Department of Labor and Industry, as applicable. Where a low-pressure safety valve or a relief valve discharges to the drainage system, the installation shall conform to the Minnesota Plumbing Code, Minnesota Rules, Chapter 4715.

Subp. 3.

Section 1006.9.

IMC Section 1006 is amended by adding a section to read as follows:

1006.9 Boiler shutdown switch. A manually operated remote shutdown switch shall be located as required by ASME CSD-1-2006.

Exception: A single hot water boiler with a rated input of less than 400,000 Btu/hr (117 kW).

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.1007 SECTION 1007 BOILER LOW-WATER CUTOFF.

Subpart 1.

Section 1007.1.

IMC Section 1007.1 is amended to read as follows:

1007.1 General. Steam and hot water boilers shall be protected with a low-water fuel cutoff control to stop the combustion operation when the water level drops below the lowest safe permissible water level in accordance with the following items:

1. An automatically fired hot water boiler or group of boilers piped together having a rated input of 400,000 Btu/hr (117 kW) or above shall be equipped with an automatic low-water fuel cutoff to stop the combustion operation when the water level drops below the lowest safe permissible water level established by the boiler manufacturer.

2. A boiler installed at an elevation where all radiation in the system is below the lowest safe permissible water level shall be equipped with an automatic low-water fuel cutoff to stop the combustion operation when the water level drops below the lowest safe permissible water level established by the boiler manufacturer.

3. A low-water fuel cutoff shall be installed when recommended by the manufacturer's installation instructions or listing and when special consideration and installations will require a low-water fuel cutoff to protect a hot water or steam boiler.

4. A means shall be provided for testing the operation of the low-water fuel cutoff without requiring the entire system to be drained.

5. A watertube or coil-type boiler requiring forced circulation to prevent overheating of the tubes or coils shall have a flow-sensing device installed, in lieu of the low-water fuel cutoff, to automatically stop the combustion operation when the circulating flow is interrupted.

Subp. 2.

[Repealed, 34 SR 537]

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.1011 SECTION 1011 TESTS.

IMC Section 1011.1 is amended to read as follows:

1011.1 Tests. Upon completion of the assembly and installation of boilers and pressure vessels, acceptance tests shall be conducted in accordance with the requirements of the ASME Boiler and Pressure Vessel Code. Where field assembly of pressure vessels or boilers is required, a copy of the completed Manufacturer's Data Report required by the ASME Boiler and Pressure Vessel Code shall be submitted to the building official.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1104

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1107

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1204 SECTION 1204 PIPE INSULATION.

IMC Section 1204.2 is amended to read as follows:

1204.2 Required thickness. Hydronic, steam, and condensate piping shall be insulated in accordance with this section.

Exceptions: Piping insulation is not required for:

1. Piping installed within HVAC equipment; or

2. Piping installed in basements, crawl spaces, and cellars.

Insulation Thickness for Nominal Pipe Diameters

Fluid Temperature Range °F	Runouts (see item C)	1 inch (25.4 mm) and Less	1.25 to 2" (31.7 to 50.8 mm)	2.5 to 4" (63.5 to 101.6 mm)	5 to 6" (127 to 152 mm)	8" (203 mm) and Larger
Piping System Type - Heating
Above 350	1.5	2.5	2.5	3.0	3.5	3.5
251-350	1.5	2.0	2.5	2.5	3.5	3.5
201-250	1.0	1.5	1.5	2.0	2.0	3.5
141-200	0.5	1.5	1.5	1.5	1.5	1.5
105-140	0.5	1.0	1.0	1.0	1.5	1.5
Piping System Type - Cooling
40-55	0.5	0.5	0.75	1	1	1
Below 40 (see item D)	1	1	1.5	1.5	1.5	1.5

A. Insulation thickness in this section assumes a k-value of 0.27. If the k-value of a product is less than 0.22, then the thickness must be adjusted to have an equivalent R-value.

B. For piping exposed to outdoor air, insulation thickness must be 0.5 inch (12.7 mm) greater than required in the table.

C. This column applies only to runouts (branches) 2 inches (50.8 mm) in diameter and less, not exceeding 12 feet (3658 mm) in length, to individual terminal units. All other runouts shall meet the requirements given in other columns in the table, as appropriate.

D. For applications with fluid temperatures of 32°F (0°C) and below, a vapor retarder shall be installed in accordance with IMC Section 604.11.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1205 SECTION 1205 VALVES.

IMC Section 1205.1.6 is amended to read as follows:

1205.1.6 Expansion tanks. Shutoff valves shall be installed at connections to nondiaphragm-type expansion tanks. The pipe between the boilers or mains and the expansion tank shall be a minimum of 1/2" nominal size. The valve between boilers or mains and an expansion tank shall have permanently attached thereto a metal tag that contains the following language stamped or etched thereon: "This valve must be open at all times, except when draining expansion tank."

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.1206 SECTION 1206 PIPING INSTALLATION.

Subpart 1.

Section 1206.1.1.

IMC Section 1206.1.1 is amended to read as follows:

1206.1.1 Prohibited tee applications. Fluid in the supply side of a hydronic system shall not enter a tee fitting through the branch opening. Fluid from two returns shall not enter on the run of the same tee.

Subp. 2.

Section 1206.12.

IMC Section 1206 is amended by adding a new subsection to the end of the section to read as follows:

1206.12 Mixing of radiation. Mixing radiation with different rates of heat transfer shall not be permitted in the same heating zone.

Exception: Engineered design installations.

Subp. 3.

Section 1206.13.

IMC Section 1206 is amended by adding a new subsection to the end of the section to read as follows:

1206.13 Draining and venting. Hydronic pipes shall be installed so that the pipes can be drained and so that air can be completely removed from the system during filling.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.1207

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1500 CHAPTER 15, REFERENCED STANDARDS.

Subpart 1.

Modifications to chapter 15.

The list of referenced standards in IMC Chapter 15 is modified as follows:

A.

References to NFPA 211-2003 shall be deleted and replaced with references to NFPA 211-2006.

B.

References to NFPA 30A-00 shall be deleted and replaced with references to NFPA 30A-08.

C.

References to NFPA 31-2001 shall be deleted and replaced with references to NFPA 31-2006.

D.

References to NFPA 58-04 shall be deleted and replaced with references to NFPA 58-11.

E.

References to NFPA 72-02 shall be deleted and replaced with references to NFPA 72-10.

Subp. 2.

Supplemental standards.

The standards listed in this part shall supplement the list of referenced documents in chapter 15 of the 2006 IMC. The standards referenced in this rule shall be considered part of the requirements of this rule shall be considered part of the requirements of this rule to the extent prescribed in each rule or reference.

A.

ASHRAE 2005 Handbook - Fundamentals;

B.

ASHRAE 15-2007 Safety Standard for Refrigeration Systems;

C.

ASHRAE 34-2007 Designation and Safety Classification of Refrigerants;

D.

ASHRAE 62.1-2004 Ventilation for Acceptable Indoor Air Quality;

E.

ASME BPVC-2007 (Sections I, II, IV, V, VIII & IX) Boiler and Pressure Vessel Code;

F.

ASME CSD-1-2006 Controls and Safety Devices for Automatically Fired Boilers;

G.

ASME B31.3-2006 Process Piping Code;

H.

ASME B31.9-2008 Building Services Piping Code;

I.

ASTM E1998-02 2007 Standard Guide for Assessing Depressurization-Induced Backdrafting and Spillage from Vented Combustion Appliances;

J.

NFPA 58-2008 Liquefied Petroleum Gas Code;

K.

NFPA 96-2008 Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations;

L.

NFPA 85-2007 Boiler and Combustion Systems Hazards Code;

M.

UL 555-2006 Standard for Fire Dampers;

N.

UL 555C-2006 Standard for Ceiling Dampers;

O.

UL 555S-1999 Standard for Smoke Dampers;

P.

NFPA 45-2004 Standard on Fire Protection for Laboratories Using Chemicals;

Q.

NFPA 211-2006 Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances;

R.

NFPA 31-2006 Standard for the Installation of Oil Burning Appliances;

S.

NFPA 90B-2006 Standard for the Installation of Warm Air Heating and Air Conditioning Systems;

T.

NFPA 85-2007 Boiler and Combustion Systems Hazards Code; and

U.

NFPA 54-2009 National Fuel Gas Code.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.02; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537; 36 SR 1479

Published Electronically:

June 12, 2012

1346.1503

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1505

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1520

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.1521

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

CHAPTER 16
INSTALLATION AND TESTING OF OIL OR LIQUID FUEL-FIRED EQUIPMENT

1346.1601 SECTION 1601 GENERAL.

The IMC is amended by adding a section to read as follows:

SECTION 1601

GENERAL

1601.1 General. Chapter 16 governs the installation, testing, or repair of: oil or liquid fuel burners, oil or liquid fuel burning systems, oil or liquid fuel burning equipment, and the oil or liquid fuel piping systems installed within, or in conjunction with, buildings or structures. The requirements of this chapter shall apply to the following equipment:

1. Equipment utilized to provide control of environmental conditions.

Exception: Equipment and appliances listed and labeled to an appropriate standard by a nationally recognized testing laboratory, which is qualified to evaluate the equipment or appliance, when installed and tested according to the manufacturer's installation instructions.

2. Equipment with a fuel input of 1,000,000 Btu/hr or greater.

3. Unlisted equipment.

4. Miscellaneous equipment when required by the building official.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1602 SECTION 1602 EQUIPMENT PLACEMENT.

The IMC is amended by adding a section to read as follows:

SECTION 1602

EQUIPMENT PLACEMENT

1602.1 Placing equipment in operation. After completion of all installations, the installer shall test all safety and operating controls and venting before placing the burner in service. The correct input of liquid fuel shall be determined and the fuel-to-air ratio set. Each oil or liquid fuel burner shall be adjusted to its proper input according to the manufacturer's instructions. Overrating the burners or the appliance is prohibited. The input range shall be appropriate to the appliance.

1. For conversion burners installed in hot water (liquid) boilers or warm air furnaces, the rate of flow of the oil or liquid fuel in Btu/h shall be adjusted to within plus or minus five percent of the design load, and not to exceed the design rate of the appliance.

2. For conversion burners installed in steam boilers, the oil or liquid fuel hourly input demand shall be adjusted to meet the steam load requirements. The oil or liquid fuel input demand necessitated by an oversized boiler shall be established and added to the input demand for load requirements to arrive at a total input demand.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1603 SECTION 1603 PILOT OPERATION.

The IMC is amended by adding a section to read as follows:

SECTION 1603

PILOT OPERATION

1603.1 Pilot operation. Igniter or pilot flames shall be effective to ignite the oil or liquid fuel at the main burner or burners and shall be adequately protected from drafts. Pilot flames shall not become extinguished during the pilot cycle when the main burner or burners are turned on or off in a normal manner either manually or by automatic controls.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1604 SECTION 1604 BURNER OPERATION.

The IMC is amended by adding a section to read as follows:

SECTION 1604

BURNER OPERATION

1604.1 Burner operation. In making tests to determine compliance with the requirements of this section, care shall be exercised to prevent the accumulation of unburned liquid fuel in the appliance that might result in an explosion or fire.

1. The flames from the burner shall freely ignite the liquid fuel when operating at the lowest firing position.

2. Burner flames shall not flash back when the liquid fuel is turned on or off by an automatic control mechanism.

3. Main burner flames shall ignite freely from the pilot when the pilot flame is reduced to a minimum point that will actuate the pilot safety device.

4. When ignition is made in a normal manner, the flame shall not flash outside the appliance.

5. Burners shall not expel liquid fuel through air openings when operating at prevailing pressure.

6. Burners shall have a proper liquid fuel air mixture to insure smooth ignition of the main burner.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1605 SECTION 1605 TEST METHODS.

The IMC is amended by adding a section to read as follows:

SECTION 1605

TEST METHODS

1605.1 Method of test.

1. Operational checking. The flue gas, venting, safety, and operating controls of the appliance shall be checked to ensure proper and safe operation.

2. Method of test - atmospheric type/induced draft type/fan assisted types. The appliance shall be allowed to operate until the stack temperature becomes stabilized after which a sample of the undiluted flue products shall be taken from the appliance flue outlet. The sample taken shall be analyzed for carbon monoxide, carbon dioxide, and oxygen. Stack temperature shall be noted.

Note: Appliance designs incorporating induced draft assemblies may require a flue gas sample to be taken after the draft regulator or induced draft fan.

3. Performance standards for atmospheric type.

a. Minimum of 75 percent efficiency as determined by flue gas analysis method at appliance flue outlet.

b. Carbon monoxide concentration in flue gas not greater than 0.04 percent.

c. Stack temperature not greater than 700°F (371°C), plus ambient.

d. Carbon dioxide concentration between 8 and 13 percent, inclusive.

e. Oxygen concentration between 4 and 10 percent.

f. Smoke test no higher than #2 for light oils, or #4 for oils heavier than #4.

g. Draft shall be in accordance with burner manufacturer's specifications.

3a. Performance standards for induced draft type/fan assisted types.

a. Minimum of 75 percent efficiency as determined by flue gas analysis method at appliance flue outlet.

b. Carbon monoxide concentration in flue gas not greater than 0.04 percent.

c. Stack temperature not greater than 700°F (371°C), plus ambient.

d. Carbon dioxide concentration between 8 and 13 percent, inclusive.

e. Oxygen concentration between 4 and 10 percent, inclusive.

f. Smoke test no higher than #2 for light oils, or #4 for oils heavier than #4.

g. Draft shall be in accordance with burner manufacturer's specifications.

Note: Induced draft and fan assisted types of appliances may require a sample to be taken after the induced draft fan, which may cause oxygen figures in excess of the limits stated. In such cases, safe liquid fuel combustion ratios shall be maintained and be consistent with appliance listing.

4. Method of test - power type. The appliance shall be allowed to operate until the stack temperature becomes stabilized after which a sample of the undiluted flue products shall be taken from the appliance flue outlet. The sample shall be analyzed for carbon monoxide, carbon dioxide, and oxygen. Stack temperature shall be recorded.

5. Performance standards for power type.

a. Minimum of 80 percent efficiency as determined by flue gas analysis method at appliance flue outlet.

b. Carbon monoxide concentration in the flue gas not greater than 0.04 percent.

c. Stack temperature not greater than 700°F (371°C) plus ambient.

d. Carbon dioxide concentration between 8 and 13 percent, inclusive.

e. Oxygen concentration between 4 and 10 percent, inclusive.

f. Smoke test no higher than #2 for light oils, or #4 for oils heavier than #4.

g. Draft shall be in accordance with burner manufacturer's specifications.

6. Test records filing; tag. After completion of the test of newly installed oil or liquid fuel burner equipment as provided in this section, complete test records shall be filed with the building official on an approved form. The tag stating the date of the test and the name of the installer shall be attached to the appliance at the main valve.

7. Oxygen concentration.

a. The concentration of oxygen in the undiluted flue products of oil or liquid fuel burners shall in no case be less than 3 percent nor more than 10 percent, shall be in conformance with applicable performance standards and shall be consistent with the appliance listing.

b. The allowable limit of carbon monoxide shall not exceed 0.04 percent.

c. The flue gas temperature of an oil appliance, as taken on the appliance side of the draft regulator, shall not exceed applicable performance standards and shall be consistent with the appliance listing.

8. Approved oxygen trim system. The oxygen figures may not apply when there is an approved oxygen trim system on the burner that is designed for that use, including a low oxygen interlock when approved by the building official.

9. Supervised start-up.

a. Supervised start-up may be required to verify safe operation of oil or liquid fuel burner and to provide documentation that operation is consistent with this code, listing and approval. Supervised start-up is required for all liquid fuel burners listed in b, c, and d. Supervised start-up requires that the liquid fuel burner shall be tested in the presence of the building official in an approved manner. Testing shall include safety and operating controls, input, flue gas analysis, and venting. Flue gas shall be tested at high, medium, and low fires. Provisions shall be made in the system to allow firing test in warm weather. After completion of the test of newly installed oil or liquid fuel burner equipment as provided in this section, complete test records shall be filed with the building official on an approved form. The tag stating the date of the test and the name of the installer shall be attached to the appliance at the main valve.

b. Oil and liquid fuel burners of 1,000,000 Btu/hr input or more require a supervised start-up as in a.

c. Installation of oxygen trim systems, modulating dampers, or other draft control or combustion devices require a supervised start-up as in a.

d. All direct fired heaters require a supervised start-up as in a.

10. Control diagram. A complete control diagram of the installation and suitable operating instructions shall be supplied to the building official.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1606 SECTION 1606 EQUIPMENT.

The IMC is amended by adding a section to read as follows:

SECTION 1606

EQUIPMENT

1606.1 Equipment information.

A. All installations of gas or fuel burners with input above 400,000 Btu/hr and all combination gas or fuel burners must be approved before installation. The following information must be supplied as required by the building official.

1. Name, model, and serial number of the burner.

2. Input rating and type of fuel.

3. Name of the nationally recognized testing laboratory that tested and listed the unit.

4. Name, model, and serial number of the furnace or boiler that the burner will be installed in if not part of a complete package.

5. A complete wiring diagram showing the factory and fuel wiring installed or to be installed including all controls, identified by the brand name and model number.

6. A print of the gas or fuel train from the manual shutoff to the appliance showing all controls that will be installed, their names, model numbers, and approvals.

B. All installations of gas or fuel burners with input above 400,000 Btu/hr and all combination gas and oil or other combination fuel burners that are installed in new or renovated boiler or equipment rooms, or are installed in a package with the boiler or furnace, shall include the following information in addition to that required in item A, subitems 1 to 6.

1. A complete piping diagram from the supply source showing all components and materials identified by brand name and model number with relevant approvals.

2. Detailed provisions for combustion air, venting, and stacks.

3. A floor plan drawn to scale showing all relevant equipment. Plans and specifications shall be approved before proceeding with an installation.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.1906

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2002

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2003

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2101

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2102

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2104

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2106

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2107

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2108

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2109

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2110

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2111

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2113

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2114

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2115

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2120

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2122

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2123

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2124

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2125

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2126

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2127

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2133

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2201

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2202

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2205

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2206

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2211

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2212

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2213

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2215

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2216

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2220

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2226

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2500

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

1346.2600

[Repealed, 29 SR 299]

Published Electronically:

October 23, 2009

MINNESOTA FUEL GAS CODE

1346.5050 TITLE; INCORPORATION BY REFERENCE.

This section is known and may be cited as the "Minnesota Fuel Gas Code." As used in this section, "the code" and "this code" refer to this section.

Chapters 2 to 8 of the 2006 edition of the International Fuel Gas Code, promulgated by the International Code Council, Inc., 500 New Jersey Avenue NW, 6th Floor, Washington, DC 20001-2070, are incorporated by reference as part of the Minnesota Fuel Gas Code with the amendments in this section. Portions of this chapter reproduce text and tables from the International Fuel Gas Code. The International Fuel Gas Code is copyright 2006 by the International Code Council, Inc. All rights reserved. As used in this section, "IFGC" means the International Fuel Gas Code incorporated in this part.

The IFGC is not subject to frequent change and a copy of the IFGC, with amendments for use in Minnesota, is available in the office of the commissioner of labor and industry.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 1 s 1; art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5101 SECTION 101 (IFGC) GENERAL.

IFGC Section 101 is amended to read as follows:

101 Scope. The Minnesota Fuel Gas Code shall apply to the installation of fuel gas piping systems, fuel gas utilization equipment, gaseous hydrogen systems, and related accessories in accordance with this part.

101.1 Gaseous hydrogen systems. Gaseous hydrogen systems shall be regulated by IFGC Chapter 7.

101.2 Piping systems. These regulations cover piping systems for natural gas with an operating pressure of 125 pounds per square inch gauge (psig) (862 kPa gauge) or less, and for LP-gas with an operating pressure of 20 psig (140 kPa gauge) or less, except as provided in IFGC Section 402.6.1. Coverage shall extend from the point of delivery to the outlet of the equipment shutoff valves. Piping system requirements shall include design, materials, components, fabrication, assembly, installation, testing, inspection, operation, and maintenance.

101.3 Gas utilization equipment. Requirements for gas utilization equipment and related accessories on the side of the meter that supplies gas to the building piping system shall include installation, combustion, and ventilation air and venting and connections to piping systems.

101.4 Systems and equipment outside the scope. This code shall not apply to the following:

1. Portable LP-gas equipment of all types that is not connected to a fixed fuel piping system.

2. Installation of farm equipment such as brooders, dehydrators, dryers, and irrigation equipment.

3. Raw material (feedstock) applications except for piping to special atmosphere generators.

4. Oxygen-fuel gas cutting and welding systems.

5. Industrial gas applications using gases such as acetylene and acetylenic compounds, hydrogen, ammonia, carbon monoxide, oxygen, and nitrogen.

6. Petroleum refineries, pipeline compressor or pumping stations, loading terminals, compounding plants, refinery tank farms, and natural gas processing plants.

7. Integrated chemical plants or portions of such plants where flammable or combustible liquids or gases are produced by, or used in, chemical reactions.

8. LP-gas installations at utility gas plants.

9. Liquefied natural gas (LNG) installations.

10. Fuel gas piping in power and atomic energy plants.

11. Proprietary items of equipment, apparatus, or instruments such as gas-generating sets, compressors, and calorimeters.

12. LP-gas equipment for vaporization, gas mixing, and gas manufacturing.

13. Temporary LP-gas piping for buildings under construction or renovation that is not to become part of the permanent piping system.

14. Installation of LP-gas systems for railroad switch heating.

15. Installation of hydrogen gas, LP-gas, and compressed natural gas (CNG) systems on vehicles.

16. Except as provided in IFGC section 401.1.1, gas piping, meters, gas pressure regulators, and other appurtenances used by the serving gas supplier in the distribution of gas, other than undiluted LP-gas.

17. Building design and construction, except as specified in this rule.

18. Piping systems for mixtures of gas and air within the flammable range with an operating pressure greater than 10 psig (69 kPa gauge).

19. Portable fuel cell appliances that are neither connected to a fixed piping system nor interconnected to a power grid.

101.5 Other fuels. The requirements for the design, installation, maintenance, alteration, and inspection of mechanical systems operating with fuels other than fuel gas shall be regulated by the Minnesota Mechanical Code, parts 1346.0050 to 1346.1500.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.5201 SECTION 201 (IFGC) GENERAL.

IFGC Section 201.4 is amended to read as follows:

201.4 Terms not defined. Where terms are not defined through the methods authorized by this chapter, the Merriam-Webster Collegiate Dictionary, available at www.m-w.com, shall be considered as providing ordinarily accepted meanings. The dictionary is incorporated by reference, is subject to frequent change, and is available through the Minitex interlibrary loan system.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.5202 SECTION 202 (IFGC) GENERAL DEFINITIONS.

Subpart 1.

Section 202.

IFGC Section 202 is amended by adding the following definitions:

GAS PIPING SYSTEM - LOW PRESSURE. A system that operates at a pressure not exceeding 14 inches of water column. LPG is a pressure not exceeding 14 inches of water column.

GAS PIPING SYSTEM - MEDIUM PRESSURE. A system that operates at a pressure exceeding 14 inches of water column but not exceeding five (5) psig. LPG is a pressure exceeding 14 inches of water column but not exceeding twenty (20) psig.

GAS PIPING SYSTEM - HIGH PRESSURE. A system that operates at a pressure exceeding five (5) psig. LPG is a pressure exceeding twenty (20) psig.

POWER VENT APPLIANCE. An appliance with a venting system that uses a fan or other mechanical means to cause the removal of flue or vent gases under positive static vent pressure.

Subp. 2.

Definition amended.

The definition of "Ready Access (to)" in IFGC Section 202, is amended to read as follows:

READY ACCESS (TO). That which enables a device, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction, and without requiring the use of portable access equipment (see "Access").

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5301 SECTION 301 (IFGC) GENERAL.

IFGC Section 301.3 is amended to read as follows:

301.3 Listed and labeled. Appliances regulated by this code shall be listed and labeled to an appropriate standard by a nationally recognized testing laboratory which is qualified to evaluate the appliance, unless otherwise approved in accordance with the administrative provisions of the Minnesota State Building Code, Minnesota Rules, chapter 1300. The approval of unlisted appliances shall be based upon engineering evaluation. Unlisted appliances shall be installed with clearances to combustibles in accordance with NFPA 54-2009. Unlisted appliances with a fuel input rating of less than 12,500,000 Btu/hr (3,660 kW) shall have fuel gas trains, controls and safety devices installed in accordance with Part CF, Combustion Side Control, of ASME CSD-1-2006. Unlisted appliances with a fuel input rating of 12,500,000 Btu/hr (3,660 kW) or greater shall have fuel gas trains, controls and safety devices installed in accordance with NFPA 85-2007.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5303

[Repealed, 34 SR 537]

Published Electronically:

October 23, 2009

1346.5304 SECTION 304 (IFGC) COMBUSTION, VENTILATION AND DILUTION AIR.

Subpart 1.

Section 304.1.

IFGC Section 304 is amended by adding language to the end of the first paragraph to read as follows:

304.1 General. Refer to IFGC Appendix E for Worksheet E-1, "Residential Combustion Air Calculation Method" and Table E-1, "Residential Combustion Air Required Volume."

Exceptions:

1. Direct vent appliances.

2. Type 1 clothes dryers that are provided with makeup air in accordance with the manufacturer's installation instructions.

3. Replacement of fuel gas utilization equipment that complies with all of the following conditions:

3.1 Replacement equipment has a Btu/hr (kW) input rating not greater than 30 percent above the original equipment input rating.

3.2 Combustion air provisions meet the code requirements in effect at the time of the original installation.

3.3 Replacement equipment shall not cause an existing mechanical system to become unsafe, hazardous, or overloaded.

Subp. 2.

[Repealed, 34 SR 537]

Subp. 3.

Section 304.6.2.

IFGC Section 304.6.2 is amended to read as follows:

304.6.2 One permanent opening method. When any natural draft equipment is installed, one permanent opening, commencing within 12 inches (300 mm) of the bottom of the enclosure, shall be provided. When other than natural draft equipment is installed, one permanent opening, commencing within 12 inches (300) of the top of the enclosure, shall be provided. The equipment shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (160 mm) from the front of the appliance. The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces that freely communicate with the outdoors and shall have a minimum free area of 1 inch²/3,000 Btu/hr (700 mm²/kW) of the total input rating of all equipment located in the enclosure.

Subp. 4.

[Repealed, 34 SR 537]

Subp. 5.

[Repealed, 34 SR 537]

Subp. 6.

[Repealed, 34 SR 537]

Subp. 7.

[Repealed, 34 SR 537]

Subp. 8.

Section 304.11.

IFGC Section 304.11 is amended to read as follows:

304.11 Combustion air ducts. Combustion air ducts shall comply with the following:

1. Ducts shall be of galvanized steel or an equivalent corrosion-resistant material. If flexible duct is used, increase the duct diameter by one inch. Flexible duct shall be stretched with minimal sags.

2. Ducts shall terminate in an unobstructed space, allowing free movement of combustion air to the appliances.

3. Ducts shall serve a single space.

4. Ducts shall not service both upper and lower combustion air openings where both such openings are used. The separation between ducts serving upper and lower combustion air openings shall be maintained to the source of combustion air.

5. Ducts shall not terminate in an attic space.

6. The remaining space surrounding a chimney liner, gas vent, special gas vent, or plastic piping installed within a masonry, metal or factory-built chimney shall not be used to supply combustion air.

Exception: Direct vent gas-fired appliances designed for installation in a solid fuel-burning fireplace where installed in accordance with the listing and the manufacturer's instructions.

7. Vertical ducts shall not extend through two or more stories without prior approval from the building official.

8. Ducts shall not terminate in the return air plenum of a forced air heating system unless installed in accordance with the heating equipment manufacturer's installation instructions.

9. Combustion air intake openings shall be located to avoid intake of exhaust air in accordance with IMC Section 401.5 and IFGC Section 503.8 and shall be covered with corrosion resistant screen of not less than 1/4 inch (6.4 mm) mesh.

10. Combustion air intake openings shall be located at least 12 inches (305 mm) above adjoining grade level.

11. When both makeup air and combustion air openings are required, they shall be provided through separate openings to the outdoors.

Exception: Combination makeup air and combustion air systems may be approved by the building official where they are reasonably equivalent in terms of health, safety, and durability.

Subp. 9.

[Repealed, 34 SR 537]

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5306 SECTION 306 (IFGC) ACCESS AND SERVICE SPACE.

Subpart 1.

Section 306.5.

IFGC Section 306.5 is amended to read as follows:

306.5 Mechanical equipment and appliances on roofs or elevated structures. Where mechanical equipment or appliances requiring periodic inspection, service or maintenance are installed on roofs or elevated structures, a permanent stair shall be provided for access.

Exception: A portable ladder may be used for dwellings, replacement equipment on existing buildings, and for exterior roof access points not exceeding 16 feet (4.9 m) above grade, unless the building official determines that the unique shape of the roof does not allow safe access with a portable ladder.

The permanent stair shall be as required by relevant safety regulations, but shall not be less than the following:

1. The stair shall be installed at an angle of not more than 60 degrees measured from the horizontal plane.

2. The stair shall have flat treads at least 6 inches (152 mm) deep and a clear width of at least 18 inches (457 mm) with equally spaced risers at least 10.5 inches (267 mm) high and not exceeding 14 inches (356 mm).

3. The stair shall have intermediate landings not exceeding 18 feet (5.5 m) vertically.

4. Continuous handrails shall be installed on both sides of the stair.

5. Interior stairs shall terminate at the under side of the roof at a hatch or scuttle of at least 8 square feet (0.74 m²) with a minimum dimension of 20 inches (508 mm).

6. When a roof access hatch or scuttle is located within 10 feet (3.0 m) of a roof edge, a guard shall be installed in accordance with IFGC Section 306.6.

7. Exterior stairs shall terminate at the roof access point or at a level landing of at least 8 square feet (0.74 m²) with a minimum dimension of 20 inches (508 mm). The landing shall have a guard installed in accordance with IFGC Section 306.6.

Subp. 2.

Section 306.5.

IFGC Section 306.5 is amended by adding a section to read as follows:

306.5.3 Permanent ladders. Where a change in roof elevation greater than 30 inches (762 mm) but not exceeding 16 feet (4.9 m) exists, a permanent ladder shall be provided. The ladder may be vertical and shall be as required by relevant safety regulations, but shall not be less than the following:

1. Width shall be at least 16 inches (406 mm).

2. Rung spacing shall be a maximum of 14 inches (356 mm).

3. Toe space shall be at least 6 inches (152 mm).

4. Side railings shall extend at least 30 inches (762 mm) above the roof or parapet wall.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.5401 SECTION 401 (IFGC) GENERAL.

Section 401.5.1. IFGC Section 401.5 is amended by adding a section to read as follows:

401.5.1 Medium and high pressure identification. Exposed medium and high pressure gas piping systems shall include the operating pressure on the label required by Section 401.5.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.5402 SECTION 402 (IFGC) PIPE SIZING.

Subpart 1.

[Repealed, 34 SR 537]

Subp. 2.

Section 402.4, Tables.

IFGC Section 402.4 is amended by adding tables as follows:

Table 402.4(2)A

Pipe Sizing Table for Natural Gas

Schedule 40 Metallic Pipe			Inlet Pressure			7" wc
For 0.60 Specific Gravity Natural Gas			Pressure Drop			1" wc
Nominal	1/4	3/8	1/2	3/4	1	1-1/4	1-1/2
Actual ID	0.364	0.493	0.622	0.824	1.049	1.380	1.610
Length (ft)		Maximum Capacity in Cubic Feet of Gas per Hour
10	61	135	248	518	976	2004	3003
20	42	93	170	356	671	1378	2064
30	34	74	137	286	539	1106	1657
40	29	64	117	245	461	947	1419
50	25	56	104	217	409	839	1257
60	23	51	94	197	370	760	1139
80	20	44	80	168	317	651	975
100	17	39	71	149	281	577	864
125	16	34	63	132	249	511	766
150	14	31	57	120	226	463	694
175	13	29	53	110	208	426	638
200	12	27	49	102	193	396	594
250	11	24	43	91	171	351	626
300	10	21	39	82	155	318	477
350	9	20	36	76	143	293	439
400	8	18	34	70	133	272	408
450	8	17	32	66	124	256	383
500	7	16	30	62	118	241	362
Nominal	2	2-1/2	3	4	5	6	8
Actual ID	2.067	2.469	3.068	4.026	5.047	6.065	7.891
Length (ft)	Maximum Capacity in Cubic Feet of Gas per Hour
10	5784	9218	16296	33239	60134	97370	194195
20	3975	6336	11200	22845	41330	66922	133469
30	3192	5088	8994	18345	33189	53741	107181
40	2732	4354	7698	115701	28406	45995	91733
50	2421	3859	6822	13916	25175	40765	81301
60	2194	3497	6182	12609	22811	36936	73665
80	1878	2993	5291	10791	19523	31612	63047
100	1664	2652	4689	9564	17303	28017	55878
125	1475	2351	4156	8477	15335	24831	49523
150	1336	2130	3765	7680	13895	22499	44872
175	1229	1960	3464	7066	12783	20699	41281
200	1144	1823	3223	6573	11892	19256	38404
250	1014	1616	2856	5826	10540	17066	34037
300	918	1464	2588	5279	9550	15463	30840
350	845	1347	2381	4856	8786	14226	28373
400	786	1253	2215	4518	8173	13235	26395
450	738	1176	2078	4239	7669	12418	24766
500	697	1110	1963	4004	7244	11730	23394

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5403 SECTION 403 (IFGC) PIPING MATERIALS.

Subpart 1.

Section 403.8.

IFGC Section 403.8 is amended to read as follows:

403.8 Protective coating. Where in contact with material, or passing through concrete or other abrasive material or atmosphere exerting a corrosive action, metallic piping and fittings coated with a corrosion-resistant material, sleeve, or casing shall be used. Steel pipe exposed in exterior locations shall be galvanized or coated with approved corrosion-resistant material. External or internal coatings or linings used on piping or components shall not be considered as adding strength.

Subp. 1a.

Section 403.10.2.

IFGC Section 403.10.2 is amended to read as follows:

403.10.2 Tubing joints. Tubing joints shall be either made with approved gas tubing fittings or brazed with a material having a melting point in excess of 1,000°F (538°C), or made by press connect fittings complying with ANSI LC-4, Press-Connect Copper and Copper Alloy, Fittings for Use in Fuel Gas Distribution Systems. Brazing alloys shall not contain more than 0.05-percent phosphorus.

Subp. 2.

Section 403.10.4.

IFGC Section 403.10.4 is amended to read as follows:

403.10.4 Metallic fittings. Metallic fittings, including valves, strainers, and filters, shall comply with the following:

1. Threaded fittings in sizes larger than 2 inches (51 mm) shall not be used except where approved.

2. Fittings used with steel or wrought-iron pipe shall be steel, brass, bronze, or malleable iron.

3. Fittings used with copper or brass pipe shall be copper, brass, or bronze.

4. Fittings used with aluminum alloy pipe shall be of aluminum alloy.

5. Brass, bronze, or copper fittings. Fittings, if exposed to soil, shall have a minimum 80 percent copper content.

6. Aluminum alloy fittings. Threads shall not form the joint seal.

7. Zinc-aluminum alloy fittings. Fittings shall not be used in systems containing flammable gas-air mixtures.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5404 SECTION 404 (IFGC) PIPING SYSTEM INSTALLATION.

Subpart 1.

Section 404.4.

IFGC Section 404.4 is amended to read as follows:

404.4 Piping through foundation wall. Underground piping shall not be installed below grade through the outer foundation or basement wall of a building. If necessary due to structural conditions, underground piping may be installed with prior approval from the building official.

Subp. 2.

Section 404.6.

IFGC Section 404.6 is amended to read as follows:

404.6 Piping in solid floors. Piping in solid floors shall be laid in channels in the floor and covered in a manner that will allow access to the piping with a minimum amount of damage to the building. Where such piping is subject to exposure to excessive moisture or corrosive substances, the piping shall be protected in an approved manner. If necessary due to structural conditions, piping may be installed in other locations with prior approval from the building official.

Subp. 3.

[Repealed, 34 SR 537]

Subp. 4.

[Repealed, 34 SR 537]

Subp. 5.

Section 404.11.

IFGC Section 404.11 is amended to read as follows:

404.11 Piping underground beneath buildings. Piping installed underground beneath buildings is prohibited except where the piping is encased in a conduit of wrought iron, plastic pipe, or steel pipe designed to withstand the superimposed loads and with prior approval from the building official. Such conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. Where the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside the building, shall be vented above grade to the outdoors, and shall be installed so as to prevent the entrance of water and insects. Such conduit shall be identified with a yellow label marked "Gas" in black letters, spaced at intervals not exceeding 5 feet (1,524 mm), and shall be located a minimum of 6 inches (152 mm) below the bottom of the concrete floor. The conduit shall be protected from corrosion in accordance with IFGC Section 404.8.

Subp. 6.

Section 404.15.

IFGC Section 404.15 is amended to read as follows:

404.15 Prohibited devices. A device shall not be placed inside the piping or fittings that will obstruct the free flow of gas.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5406 SECTION 406 (IFGC) INSPECTION, TESTING AND PURGING.

Subpart 1.

Section 406.1.2.

IFGC Section 406.1.2 is amended to read as follows:

406.1.2 Alterations, repairs and additions. In the event alterations, repairs or additions are made following the pressure test, the affected piping shall be tested.

Exception: Equipment replacement, minor alterations, repairs, or additions, provided the work is inspected and connections are tested with a noncorrosive leak-detecting fluid or other leak-detecting methods approved by the building official.

Subp. 2.

Section 406.1.5.

IFGC Section 406.1.5 is deleted.

Subp. 3.

Section 406.4.1.

IFGC Section 406.4.1 is amended to read as follows:

406.4.1 Test pressure. The test pressure to be used shall be no less than one and one-half times the proposed maximum working pressure, but not less than 25 psig (172 kPa gauge), irrespective of design pressure. Where the test pressure exceeds 125 psig (862 kPa gauge), the test pressure shall not exceed a value that produces a hoop stress in the piping greater than 50 percent of the specified minimum yield strength of the pipe.

Subp. 4.

Section 406.4.2.

IFGC Section 406.4.2 is amended to read as follows:

406.4.2 Test duration. Test duration shall be not less than one-half hour. When testing a system in a single-family dwelling, the test duration shall be permitted to be reduced to 10 minutes with prior approval from the building official.

Subp. 5.

Section 406.4.

IFGC Section 406.4 is amended by adding a section to read as follows:

406.4.3 Test gauges. Tests which utilize dial gauges shall be performed with gauges of 2 psi (13.8 kPa) incrementation or less and shall have a pressure range not greater than twice the test pressure applied. The test pressure shall be within the middle 50 percent of the test gauge pressure range.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5407 SECTION 407 (IFGC) PIPING SUPPORT.

IFGC Section 407 is amended by adding a section to read as follows:

407.3 Expansion and flexibility. Piping systems shall be designed to have sufficient flexibility to prevent thermal expansion or contraction from causing excessive stresses in the piping material, excessive bending or loads at joints, or undesirable forces at points of connections to equipment and at anchorage or guide points.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.5408 SECTION 408 (IFGC) DRIPS AND SLOPED PIPING.

IFGC Section 408.4 is amended to read as follows:

408.4 Sediment trap. A sediment trap shall be installed before all automatically controlled gas utilization equipment where a sediment trap is not incorporated as part of the equipment. The sediment trap shall be installed as close to the inlet of the equipment as practical, before any regulator or automatic gas valve, and ahead of all pounds-to-inches pressure regulators. The sediment trap shall be either a tee fitting with a capped nipple, a minimum of 3 inches (80 mm) in length, in the bottom opening of the run of the tee, or other device approved as an effective sediment trap. If a tee fitting is used, it shall provide a 90-degree change of direction of gas flow and the cap shall be at an elevation lower than the tee fitting.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.5409 SECTION 409 (IFGC) SHUTOFF VALVES.

Subpart 1.

Section 409.1.

IFGC Section 409.1 is amended by adding subsection 409.1.4 to read as follows:

409.1.4 Main shutoff valve. Piping systems shall be provided with an approved main shutoff valve before the first branch line. The main shutoff valve shall be installed in the first available location inside the building that provides ready access and shall have a permanently attached handle.

Exception: Gas piping that serves equipment on the roof of a building shall install the shutoff valve on the roof, ten feet or more from the roof's edge, before the first branch line.

Main shutoff valves controlling several gas piping systems shall be protected from physical damage and shall be placed an adequate distance from each other so they will be easy to operate.

Subp. 2.

Section 409.2.

IFGC Section 409.2 is amended to read as follows:

409.2 Meter valve. Every meter shall be equipped with a shutoff valve located on the side of the meter that supplies gas to the building piping system. The main shutoff valve required in subpart 1 shall serve as the shutoff valve.

Subp. 3.

Section 409.3.1.

IFGC Section 409.3.1 is amended to read as follows:

409.3.1 Multiple tenant buildings. In multiple tenant buildings, where a common piping system is installed to supply other than one- and two-family dwellings, shutoff valves shall be provided for each tenant. Each tenant shall have access to the shutoff valve serving that tenant's space. A main shutoff valve shall be installed in a common utility room or otherwise located to provide ready access to all tenants of the building, and it shall not be located in a locked room without prior permission from the building official.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5410 SECTION 410 (IFGC) FLOW CONTROLS.

IFGC Section 410.3 is amended to read as follows:

410.3 Venting of regulators. Pressure regulators that require a vent shall have an independent vent to the outside of the building. The vent shall be designed to prevent the entry of water or foreign objects. Regulator vents shall terminate at least 3 feet (914 mm) from doors, operable windows, nonmechanical intake openings, and openings into direct-vent appliances. The vent termination shall be located at least 12 inches (305 mm) above grade and shall be suitably screened and hooded to prevent accidental closure of the vent pipe.

Exception: A vent to the outside of the building is not required for regulators equipped with and labeled for utilization with approved vent-limiting devices installed in accordance with the manufacturer's instructions.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.5501 SECTION 501 (IFGC) GENERAL.

Subpart 1.

Section 501.7.

IFGC Section 501.7 is amended to read as follows:

501.7 Connection to fireplace. Connection of any appliance to chimney flues serving fireplaces is prohibited. Refer to IFGC Section 602 for Decorative Appliances for Installation in Fireplaces and IFGC Section 603 for Log Lighters.

Subp. 2.

Section 501.8.

IFGC Section 501.8 is amended to read as follows:

501.8 Equipment not required to be vented. The following appliances shall not be required to be vented.

1. Ranges.

2. Built-in domestic cooking units listed and marked for optional venting.

3. Hot plates and laundry stoves.

4. Type 1 clothes dryers (Type 1 clothes dryers shall be exhausted in accordance with the requirements of IFGC Sections 613 and 614).

5. A single booster-type automatic instantaneous water heater, where designed and used solely for the sanitizing rinse requirements of a dishwashing machine, provided that the heater is installed in a commercial kitchen having a mechanical exhaust system. Where installed in this manner, the draft hood, if required, shall be in place and unaltered and the draft hood outlet shall be not less than 36 inches (914 mm) vertically and 6 inches (152 mm) horizontally from any surface other than the heater.

6. Refrigerators.

7. Counter appliances.

8. Direct-fired make-up air heaters.

9. Other equipment listed for unvented use and not provided with flue collars.

10. Specialized equipment of limited input such as laboratory burners and gas lights.

Automatically operated equipment vented with a hood or exhaust system shall comply with IFGC Section 503.3.4. Where the appliances and equipment listed in items 5 through 10 are installed so that the aggregate input rating exceeds 20 Btu/hr per cubic foot (207 watts per m³) of volume of the room or space in which such appliances and equipment are installed, one or more shall be provided with venting systems or other approved means for conveying the vent gases to the outdoor atmosphere so that the aggregate input rating of the remaining unvented appliances and equipment does not exceed the 20 Btu/hr per cubic foot (207 watts per m³) figure. Where the room or space in which the equipment is installed is directly connected to another room or space by a doorway, archway, or other opening of comparable size that cannot be closed, the volume of such adjacent room or space shall be permitted to be included in the calculations.

Subp. 3.

Section 501.12.

IFGC Section 501.12 is amended to read as follows:

501.12 Residential and low-heat appliances flue lining systems. An approved metallic liner shall be installed in masonry chimneys used to vent gas appliances. The liner shall comply with one of the following:

1. Aluminum (1100 or 3003 alloy or equivalent) not less than 0.032 inches thick to 8 inches diameter.

2. Stainless steel (304 or 430 alloy or equivalent) not less than 26 gauge (0.018 inches thick) to 8 inches diameter or not less than 24 gauge (0.024 inches thick) 8 inches diameter and larger.

3. Listed vent systems.

Exception: Metallic liners are not required when each appliance connected into the masonry chimney has a minimum input rating greater than 400,000 Btu/hr.

501.12.1 Terminations. Metallic liners shall terminate in accordance with the requirements for gas vents in IFGC Section 503.6.6.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5503 SECTION 503 (IFGC) VENTING OF EQUIPMENT.

Subpart 1.

Section 503.2.2.

IFGC Section 503.2.2 is deleted.

Subp. 2.

[Repealed, 34 SR 537]

Subp. 3.

Section 503.5.5.

IFGC Section 503.5.5 is amended to read as follows:

503.5.5 Size of chimneys. The effective area of a chimney venting system serving listed appliances with draft hoods, Category I appliances, and other appliances listed for use with Type B vents shall be in accordance with IFGC Section 504 or other approved engineering methods.

Exceptions:

1. As an alternate method of sizing an individual chimney venting system for a single appliance with a draft hood, the effective areas of the vent connector and chimney flue shall be not less than the area of the appliance flue collar or draft hood outlet, nor greater than four times the draft hood outlet area.

2. As an alternate method for sizing a chimney venting system connected to two appliances with draft hoods, the effective area of the chimney flue shall be not less than the area of the larger draft hood outlet plus 50 percent of the area of the smaller draft hood outlet, nor greater than four times the smallest draft hood outlet area.

Where an incinerator is vented by a chimney serving other gas utilization equipment, the gas input to the incinerator shall not be included in calculating chimney size, provided the chimney flue diameter is not less than 1 inch (25.4 mm) larger in equivalent diameter than the diameter of the incinerator flue outlet.

Subp. 4.

Section 503.5.6.

IFGC Section 503.5.6 is amended to read as follows:

503.5.6 Inspection of chimneys. Before replacing an existing appliance or connecting a vent connector to a chimney, the chimney passageway shall be examined to ascertain that it is clear and free of obstructions and it shall be cleaned if previously used for venting solid or liquid fuel-burning appliances or fireplaces.

Exception: Existing chimneys shall be lined in accordance with amended IFGC Section 501.12 unless otherwise approved by the building official.

Subp. 5.

[Repealed, 34 SR 537]

Subp. 6.

Section 503.6.9.1.

IFGC Section 503.6.9.1 is amended to read as follows:

503.6.9.1 Category I appliances. The sizing of natural draft venting systems serving one or more listed appliances equipped with a draft hood or appliances listed for use with Type B gas vent, installed in a single story of a building, shall be in accordance with one of the following methods:

1. The provisions of Section 504.

2. For sizing an individual gas vent for a single draft-hood-equipped appliance, the effective area of the vent connector and the gas vent shall be not less than the area of the appliance draft hood outlet, nor greater than four times the draft hood outlet area.

3. For sizing a gas vent connected to two appliances with draft hoods, the effective area of the vent shall be not less than the area of the larger draft hood outlet plus 50 percent of the area of the smaller draft hood outlet, nor greater than four times the smaller draft hood outlet area.

4. Approved engineering practices.

Subp. 7.

Section 503.7.8.

IFGC Section 503.7.8 is amended to read as follows:

503.7.8 Size of single-wall metal pipe. A venting system constructed of single-wall metal pipe shall be sized in accordance with one of the following methods and the equipment manufacturer's instructions:

1. For a draft hood-equipped appliance, in accordance with IFGC Section 504.

2. For a venting system for a single appliance with a draft hood, the areas of the connector and the pipe each shall be not less than the area of the appliance flue collar or draft hood outlet, whichever is smaller. The vent area shall not be greater than four times the draft hood outlet area.

3. Other approved engineering methods.

Subp. 8.

[Repealed, 34 SR 537]

Subp. 9.

Section 503.10.7.

IFGC Section 503.10.7 is amended to read as follows:

503.10.7 Joints. Joints between sections of connector piping and connections to flue collars and hood outlets shall be fastened by one of the following methods:

1. Three sheet metal screws equally spaced in accessible locations on the circumference of the vent.

2. Vent connectors of listed vent material assembled and connected to flue collars or draft hood outlets in accordance with the manufacturers' instructions.

3. Other approved means.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5504 SECTION 504 (IFGC) SIZING OF CATEGORY 1 APPLIANCE VENTING SYSTEMS.

Subpart 1.

Section 504.2.7.

IFGC Section 504.2.7 is amended to read as follows:

504.2.7 Liner system sizing. Listed corrugated metallic chimney liner systems in masonry chimneys shall be sized by using IFGC Table 504.2(1) or 504.2(2) for Type B vents with the maximum capacity reduced by 20 percent (0.80 x maximum capacity) and the minimum capacity as shown in IFGC Table 504.2(1) or 504.2(2). Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity further reduced in accordance with IFGC Section 504.3. Approved metallic liners, other than listed corrugated metallic liner systems, installed in accordance with amended IFGC Section 501.12, shall be sized by using IFGC Table 504.2(1) or 504.2(2) for Type B vents. When IFGC Table 504.2(1) or 504.2(2) permits more than one diameter for a connector or vent of a fan-assisted appliance, the smallest permitted diameter shall be used.

Subp. 2.

Section 504.2.8.

IFGC Section 504.2.8 is amended to read as follows:

504.2.8 Vent area and diameter. Where the vertical vent has a larger diameter than the vent connector, the vertical vent diameter shall be used to determine the minimum vent capacity, and the connector diameter shall be used to determine the maximum vent capacity. The flow area of the vertical vent shall not exceed four times the flow area of the listed appliance categorized vent area, flue collar area, or draft hood outlet area unless designated in accordance with approved engineering methods.

Subp. 3.

Section 504.3.17.

IFGC Section 504.3.17 is amended to read as follows:

504.3.17 Vertical vent maximum size. Where two or more appliances are connected to a vertical vent or chimney, the flow area of the largest section of vertical vent or chimney shall not exceed four times the smallest listed appliance categorized vent areas, flue collar area, or draft hood outlet area unless designed in accordance with approved engineering methods.

Subp. 4.

Section 504.3.19.

IFGC Section 504.3.19 is amended to read as follows:

504.3.19 Liner system sizing. Listed corrugated metallic chimney liner systems in masonry chimneys shall be sized by using IFGC Table 504.3(1) or 504.3(2) for Type B vents, with the maximum capacity reduced by 20 percent (0.80 x maximum capacity) and the minimum capacity as shown in IFGC Table 504.3(1) or 504.3(2). Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity further reduced in accordance with IFGC Sections 504.3.5 and 504.3.6. Approved metallic liners, other than listed corrugated metallic liner systems, installed in accordance with amended IFGC Section 501.12, shall be sized by using IFGC Table 504.3(1) or 504.3(2) for Type B vents. When IFGC Table 504.3(1) or 504.3(2) permits more than one diameter for a connector or vent of a fan-assisted appliance, the smallest permitted diameter shall be used.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5602 SECTION 602 (IFGC) DECORATIVE APPLIANCES FOR INSTALLATION IN FIREPLACES.

Subpart 1.

Section 602.1.

IFGC Section 602.1 is amended to read as follows:

602.1 General. Decorative appliances for installation in approved solid fuel burning fireplaces shall be tested in accordance with ANSI Z21.50-2000, Vented Gas Fireplaces, and ANSI Z21.88-2000, Vented Gas Fireplace Heaters, and shall be installed in accordance with the manufacturer's installation instructions. Manually lighted natural gas decorative appliances shall be tested in accordance with an approved method.

Subp. 2.

Section 602.3.

IFGC Section 602.3 is amended to read as follows:

602.3 Prohibited installations. Decorative appliances for installations in fireplaces shall not be installed where prohibited by IFGC Section 303.3. Unvented decorative appliances shall not be installed in any dwelling or occupancy.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

October 23, 2009

1346.5620

[Repealed, 34 SR 537]

Published Electronically:

October 23, 2009

1346.5621 SECTION 621 (IFGC) UNVENTED ROOM HEATERS.

IFGC Section 621 is deleted in its entirety and replaced with the following:

Unvented room heaters and unvented decorative appliances shall not be installed in any dwelling or occupancy.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.5629

[Repealed, 34 SR 537]

Published Electronically:

October 23, 2009

1346.5630 SECTION 630 (IFGC) INFRARED RADIANT HEATERS.

Subpart 1.

[Repealed, 34 SR 537]

Subp. 2.

[Repealed, 34 SR 537]

Subp. 3.

Section 630.

IFGC Section 630 is amended by adding a subsection to read as follows:

630.3 Ventilation air. Where unvented infrared heaters are installed, mechanical ventilation shall be provided to exhaust at least 4 cubic feet per minute (cfm) (0.0203 m³/s) per 1,000 Btu/hr (0.292 kW) input rating and it shall be electrically interlocked with the heater. Makeup air shall be provided to the space to be heated.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5631 SECTION 631 (IFGC) BOILERS.

IFGC Section 631.1 is amended to read as follows:

631.1 Standards. Boilers with an input rating below 400,000 Btu/hr (3,660 kW) shall be listed in accordance with the requirements of ANSI Z21.13/CSA 4.9 or UL 795. Boilers with an input rating of 400,000 Btu/hr (3,660 kW) or greater shall be designed and constructed in accordance with the BPVC-2007 ASME Boiler and Pressure Vessel Code, Sections I, II, IV, V, VIII, and IX, and amended IFGC Section 301.3, as applicable. Boilers with an input rating above 400,000 Btu/hr (117 kW) and less than 12,500,000 Btu/hr (3,660 kW) shall comply with ASME CSD-1-2006, and boilers with an input rating of 12,500,000 Btu/hr (3,660 kW) or greater shall comply with NFPA 85-2007, Boiler and Combustion Systems Hazards Code.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.5800 CHAPTER 8 REFERENCED STANDARDS.

Subpart 1.

Modifications to IFGC chapter 8.

The list of referenced standards in IFGC chapter 8 is modified as follows:

A.

References to NFPA 30A-03 shall be deleted and replaced with references to NFPA 30A-08.

B.

References to NFPA 58-04 shall be deleted and replaced with references to NFPA 58-11.

Subp. 2.

Supplemental standards.

The standards listed in this part shall supplement the list of referenced documents in chapter 8 of the 2006 IFGC. The standards referenced in this rule shall be considered part of the requirements of this rule to the extent prescribed in each rule or reference.

A.

NFPA 54-2009 National Fuel Gas Code;

B.

NFPA 85-2007 Boiler and Combustion Systems Hazards Code; and

C.

ASME CSD-1 2006 Controls and Safety Devices for Automatic Boilers.

Statutory Authority:

MS s 326B.02; 326B.101; 326B.106; 326B.13

History:

34 SR 537; 36 SR 1479

Published Electronically:

June 12, 2012

CHAPTER 8
INSTALLATION AND TESTING OF FUEL GAS-FIRED EQUIPMENT

1346.5801

[Renumbered 1346.5901]

Published Electronically:

October 23, 2009

1346.5802

[Renumbered 1346.5902]

Published Electronically:

October 23, 2009

1346.5803

[Renumbered 1346.5903]

Published Electronically:

October 23, 2009

1346.5804

[Renumbered 1346.5904

Published Electronically:

October 23, 2009

1346.5805

[Renumbered 1346.5905]

Published Electronically:

October 23, 2009

1346.5806

[Renumbered 1346.5906]

Published Electronically:

October 23, 2009

1346.5807

[Renumbered 1346.5907

Published Electronically:

October 23, 2009

1346.5900

[Renumbered 1346.6000]

Published Electronically:

October 23, 2009

1346.5901 SECTION 901 (IFGC) GENERAL.

The IFGC is amended by adding a chapter to read as follows:

SECTION 901

GENERAL

901.1 General. Chapter 9 shall regulate the installation and testing or repair of gas or fuel burning systems, gas or fuel burners, and gas or fuel burning equipment installed within, or in conjunction with, building or structures. The requirements

of this chapter shall apply to the following equipment:

1. Equipment utilized to provide control of environmental conditions.

Exception: Equipment and appliances listed and labeled to an appropriate standard by a nationally recognized testing laboratory, which is qualified to evaluate the equipment or appliance, when installed and tested according to the manufacturer's installation instructions.

2. Equipment with a fuel input of 1,000,000 Btu/hr or greater.

3. Unlisted equipment.

4. Miscellaneous equipment when required by the building official.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5902 SECTION 902 (IFGC) EQUIPMENT PLACEMENT.

The IFGC is amended by adding a section to read as follows:

SECTION 902

EQUIPMENT PLACEMENT

902.1 Placing equipment in operation. After completion of the installation, all safety and operating controls and venting shall be tested before placing the burner in service. The correct input of fuel shall be determined and the fuel-to-air ratio set. Each gas or fuel burner shall be adjusted to its proper input according to the manufacturer's instructions. Overrating the burners or appliance is prohibited. Btu/hr input range shall be appropriate to the appliance.

1. The rate of flow of the gas or fuel shall be adjusted to within plus or minus two percent of the required Btu/hr rating at the manifold pressure specified by the manufacturer. When the prevailing pressure is less than the manifold pressure specified, the rates shall be adjusted at the prevailing pressure.

2. For conversion burners installed in hot water (liquid) boilers or warm air furnaces, the rate of flow of the gas or fuel in Btu/hr shall be adjusted to within plus or minus five percent of the calculated Btu/hr heat loss of the building in which it is installed, or the design load, and shall not exceed the design rate of the appliance.

3. For conversion burners installed in steam boilers, the gas or fuel hourly input demand shall be adjusted to meet the steam load requirements. The gas or fuel input demand necessitated by an oversized boiler shall be established and added to the input demand for load requirements to arrive at a total input demand.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5903 SECTION 903 (IFGC) PILOT OPERATION.

The IFGC is amended by adding a section to read as follows:

SECTION 903

PILOT OPERATION

903.1 Pilot operation. Pilot flames shall ignite the gas or fuel at the main burner or burners and shall be adequately protected from drafts. Pilot flames shall not become extinguished during pilot cycle when the main burner or burners are turned on or off in a normal manner, either manually or by automatic controls.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; l 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5904 SECTION 904 (IFGC) BURNER OPERATION.

The IFGC is amended by adding a section to read as follows:

SECTION 904

BURNER OPERATION

904.1 Burner operation. When testing to determine compliance with this section, care shall be exercised to prevent the accumulation of unburned gas or fuel in the appliance or flues that might result in explosion or fire.

1. The flames from each burner shall freely ignite the gas or fuel from adjacent burners when operating at the prevailing gas or fuel pressure and when the main control valve is regulated to deliver at one-third of the fuel gas or fuel rate.

2. Burner flames shall not flash back after immediate ignition nor after turning the fuel cock until the flow rate to the burner is one-third the full supply.

3. Burner flames shall not flash back when the gas or fuel is turned on or off by an automatic control mechanism.

4. Main burner flames shall ignite freely from each pilot when the main control valve is regulated to one-third the full gas or fuel rate and when the pilot flame is reduced to a minimum point at which it will actuate the safety device.

5. When ignition is made in a normal manner, the flame shall not flash outside the appliance.

6. Burners shall not expel gas or fuel through air openings when operating at prevailing pressure.

7. Burners shall have proper fuel air mixture to ensure smooth ignition of the main burner.

8. Dual fuel burners may have controls common or independent to both fuels. Transfer from one fuel to the other shall be by a manual interlock switching system to prevent the gas and other fuel being used simultaneously except by special permission from the building official. The building official shall consider whether an exception will provide equivalent safety. The transfer switch shall have a center off position and shall not pass through the center off position without stopping in the center off position.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5905 SECTION 905 (IFGC) METHOD OF TEST.

The IFGC is amended by adding a section to read as follows:

SECTION 905

METHOD OF TEST

905.1 Method of test.

1. Operational checking. The flue gas, venting, safety and operating controls of the appliance shall be checked to ensure proper and safe operation.

2. Method of test - atmospheric type/induced draft type/fan-assisted type. The appliance shall be allowed to operate until the stack temperature becomes stabilized after which a sample of the undiluted flue products shall be taken from the appliance flue outlet. The sample taken shall be analyzed for carbon monoxide, carbon dioxide and oxygen. Stack temperature shall be noted.

Note: Appliance designs incorporating induced draft assemblies may require a flue gas sample to be taken after the draft regulator or induced draft fan.

3.1. Performance standards for atmospheric type.

a. Minimum of 75 percent efficiency as determined by flue gas analysis method at appliance flue outlet.

b. Carbon monoxide concentration in flue gas not greater than 0.04 percent on an air-free basis.

c. Stack temperature not greater than 480°F, plus ambient.

d. Carbon dioxide concentration between 6 and 9 percent, inclusive.

e. Oxygen concentration between 4 and 10 percent, inclusive.

3.2. Performance standards for induced draft type/fan-assisted type.

a. Minimum of 75 percent efficiency as determined by flue gas analysis method at appliance flue outlet.

b. Carbon monoxide concentration in flue gas not greater than 0.04 percent on an air free basis.

c. Stack temperature not greater than 480°F, plus ambient.

d. Oxygen concentration between 4 and 10 percent, inclusive, with carbon dioxide concentration between 6 and 9 percent, inclusive.

Note: Induced draft type and fan-assisted type appliances may require a sample to be taken after the induced draft fan, which may cause oxygen figures in excess of limits stated. In such cases, safe fuel combustion ratios shall be maintained and be consistent with appliance listing.

4. Method of test - power type. The appliance shall be allowed to operate until the stack temperature becomes stabilized after which a sample of the undiluted flue products shall be taken from the appliance flue outlet. The sample shall be analyzed for carbon monoxide, carbon dioxide and oxygen. Stack temperature shall be recorded.

5. Performance standards for power type.

a. Minimum of 80 percent efficiency as determined by flue gas analysis method method at appliance flue outlet.

b. Carbon monoxide concentration in flue gas not greater than 0.04 percent.

c. Stack temperature not greater than 480°F plus ambient, or 125°F in excess of fluid temperature plus ambient.

d. Carbon dioxide concentration between 6 and 9 percent, inclusive.

e. Oxygen concentration between 3 and 10 percent, inclusive.

6. After completion of the test of newly installed gas or fuel burner equipment as provided in this section, complete test records shall be filed with the building official on an approved form. The tag stating the date of the test and the name of the installer shall be attached to the appliance at the main valve.

7. Oxygen concentration.

a. The concentration of oxygen in the undiluted flue products of gas or fuel burners shall in no case be less than 3 percent nor more than 10 percent, shall be in conformance with applicable performance standards and shall be consistent with the appliance listing.

b. The allowable limit of carbon monoxide shall not exceed 0.04 percent.

c. The flue gas temperature of a gas appliance, as taken on the appliance side of the draft regulator, shall not exceed applicable performance standards and shall be consistent with the appliance listing.

8. Approved oxygen trim system. The oxygen figures may not apply when there is an approved oxygen trim system on the burner that is designed for that use, including a low oxygen interlock when approved by the building official. The building official shall consider whether an exception will provide equivalent safety.

9. Supervised start-up.

a. Supervised start-up may be required to verify safe operation of gas or fuel burner and to provide documentation that operation is consistent with this code, listing and approval. Supervised start-up is required for all fuel burners in b, c, and d. Supervised start-up requires that fuel burners shall be tested in the presence of the building official in an approved manner. Testing shall include safety and operating controls, input, flue gas analysis, and venting. Flue gas shall be tested at high, medium and low fires. Provisions shall be made in the system to allow firing test in warm weather. After completion of the test of newly installed gas or fuel burner equipment as provided in this section, complete test records shall be filed with the building official on an approved form. The tag stating the date of the test and the name of the installer shall be attached to the appliance at the main valve.

b. Gas and fuel burners of 1,000,000 Btu/hr input or more require a supervised start-up as in a.

c. Installation of oxygen trim systems, modulating dampers, or other draft control or combustion devices require a supervised start-up as in a.

d. All direct fired heaters require a supervised start-up as in a.

10. A complete control diagram of the installation and suitable operating instructions shall be supplied to the building official.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5906 SECTION 906 (IFGC) PRESSURE REGULATORS.

The IFGC is amended by adding a section to read as follows:

SECTION 906

PRESSURE REGULATORS

906.1 Pressure regulators.

(a) General.

1. Regulators shall be provided with access for servicing.

2. Regulators shall be provided with a shutoff valve, union and test taps (both upstream and downstream of the regulator) for servicing.

3. All regulators with inlet gas pressure exceeding 14 inches water column pressure or used on an appliance having an input exceeding 400,000 Btu/hr shall have an approved high pressure manual gas valve in the supply piping upstream of the regulator.

4. All regulators with inlet gas pressure exceeding 14 inches water column pressure or used on an appliance having an input exceeding 400,000 Btu/hr shall be vented to the outdoors in separate vents sized according to the manufacturer's specifications.

Exception: Regulators equipped with limiting orifices installed in accordance with amended IFGC Section 410.3.

5. Regulators may not be vented into a combustion chamber or an appliance vent.

6. Regulator vents shall terminate at least 3 feet (914 mm) from doors, operable windows, nonmechanical intake openings, and openings into direct-vent appliances. The vent termination shall be located at least 12 inches (305 mm) above grade and shall be suitably screened and hooded to prevent accidental closure of the vent pipe.

7. All pounds-to-pounds and pounds-to-inches regulators used as appliance regulators where downstream controls are not rated for upstream pressure shall be of the full lock-up type.

(b) Appliance.

1. Appliance regulators shall be installed consistent with the listing and approval of the equipment and the listing and approval of the regulator manufacturer.

2. Each gas burner or appliance shall have its own gas pressure regulator. This appliance regulator is in addition to any pounds-to-pounds or pounds-to-inches regulators in the system.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.5907 SECTION 907 (IFGC) EQUIPMENT INFORMATION.

The IFGC is amended by adding a section to read as follows:

SECTION 907

EQUIPMENT INFORMATION

907.1 Equipment information.

A. All installations of gas or fuel burners with input above 400,000 Btu/hr and all combination gas or fuel burners shall be approved before installation. The following information shall be supplied if required by the building official.

1. Name, model, and serial number of the burner.

2. Input rating and type of fuel.

3. Name of the nationally recognized testing laboratory that tested and listed the unit.

4. Name, model, and serial number of the furnace or boiler that the burner will be installed in if not part of a complete package.

5. A complete wiring diagram showing the factory and fuel wiring installed or to be installed including all controls, identified by the brand name and model number.

6. A print of the gas or fuel train from the manual shutoff to the appliance showing all controls that will be installed, their names, model numbers, and approvals.

B. All installations of gas or fuel burners with input above 400,000 Btu/hr and all combination gas and oil or other combination fuel burners that are installed in new or renovated boiler or equipment rooms, or are installed in a package with the boiler or furnace, shall include the following information in addition to that required in item A, subitems 1 to 6.

1. A complete piping diagram from the supply source showing all components and materials identified by brand name and model number with relevant approvals.

2. Detailed provisions for combustion air, venting, and stacks.

3. A floor plan drawn to scale showing all relevant equipment. Plans and specifications shall be approved before proceeding with an installation.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.6000 SECTION 1000 MANUFACTURED HOME PARK/COMMUNITY FUEL GAS EQUIPMENT AND INSTALLATION.

The IFGC is amended by adding a chapter to read as follows:

CHAPTER 10

MANUFACTURED HOME PARK/COMMUNITY FUEL GAS

EQUIPMENT AND INSTALLATION

1001 General. Except as otherwise permitted or required by this chapter, all fuel gas equipment and installations in manufactured home parks and communities shall comply with the provisions of this code. The provisions of this chapter shall not apply to manufactured home gas piping and equipment.

1002 Required gas supply. The minimum hourly volume of gas required at each manufactured home lot outlet or any section of the manufactured home gas piping system shall be calculated as shown in IFGC Table 1002. Required gas supply for buildings or other fuel gas utilization equipment connected to the manufactured home gas piping system shall be calculated as provided in this code.

Table 1002

Demand Factors for Calculating Gas Piping Systems in Manufactured Home Parks and Communities

	Number of Manufactured Home Sites			Demand Factor (Btu/hr) per Manufactured Home Site			Demand Factor (Watts) per Manufactured Home Site
	1			125,000			36,638
	2			117,000			34,293
	3			104,000			30,482
	4			96,000			28,138
	5			92,000			26,965
	6			87,000			25,500
	7			83,000			24,327
	8			81,000			23,741
	9			79,000			23,155
	10			77,000			22,569
11-20				66,000			19,345
21-30				62,000			18,172
31-40				58,000			17,000
41-60				55,000			16,121
Over 60				50,000			14,655

1003 Installation. Gas piping shall not be installed underground beneath buildings or that portion of the manufactured home lot reserved for the location of manufactured homes, manufactured home accessory buildings or structures, concrete slabs, or automobile parking, unless installed in a gas-tight conduit complying with the following:

1. The conduit shall be of material approved for installation underground beneath buildings and not less than Schedule 40 pipe. The interior diameter of the conduit shall be not less than 0.5 inch (15 mm) larger than the outside diameter of the gas piping.

2. The conduit shall extend to a point not less than 12 inches (305 mm) beyond any area where it is required to be installed, or the outside wall of a building, and the outer ends shall not be sealed. Where the conduit terminates within a building, it shall be provided with access, and the space between the conduit and the gas piping shall be sealed to prevent leakage of gas into the building.

Exception: A gas piping lateral terminating in a manufactured home lot riser surrounded by a concrete slab shall not be required to be installed in a conduit, provided the concrete slab is entirely outside the wall line of the manufactured home, and is used for stabilizing other utility connections.

1004 Manufactured home lot shutoff valve. Each manufactured home lot shall have an approved gas shutoff valve installed upstream of the manufactured home lot gas outlet and located on the outlet riser at a height at least 6 inches (152 mm) above grade. Such valve shall not be located under a manufactured home. When the manufactured home lot is not in use, the outlet shall be equipped with an approved cap or plug to prevent accidental discharge of gas.

1005 Manufactured home lot gas outlet. Each manufactured home lot piped for gas shall be provided with an individual outlet riser at the manufactured home lot. The manufactured home lot gas outlet shall terminate with the point of delivery in the rear third section and within 4 feet (1,219 mm) of the proposed location of the manufactured home.

1007 Mechanical protection. All gas outlet risers, regulators, meters, valves, or other exposed equipment shall be protected from mechanical damage. Atmospherically controlled regulators shall be installed in such a manner that moisture cannot enter the regulator vent and accumulate above the diaphragm. Where the regulator vent may be obstructed due to snow and icing conditions, shields, hoods, or other suitable devices shall be provided to guard against closing the vent opening.

1008 Meters. Meters shall not be installed in unvented or inaccessible locations or closer than 3 feet (914 mm) from sources of ignition. When meters are installed, they shall not depend on the gas outlet riser for support, but shall be adequately supported by a post or bracket placed on a firm footing, or other means providing equivalent support.

1009 Meter shutoff valve. All meter installations shall be provided with a shutoff valve located adjacent to and on the inlet side of the meter. For installations utilizing a liquefied petroleum gas container, the container service valve shall serve as the shutoff valve.

1010 Gas pipe sizing. The size of each section of natural gas or liquefied petroleum gas piping systems shall be determined as specified in this code.

1011 Maintenance. The manufactured home park/community operator shall be responsible for maintaining all gas piping installations and equipment in good working condition.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

29 SR 299; L 2007 c 140 art 4 s 61; art 13 s 4; 34 SR 537

Published Electronically:

October 23, 2009

1346.6010 IMC APPENDIX C, TABLE C-1.

IMC Appendix C, Table C-1

Recommended Capacities for Domestic Kitchen Exhaust Hoods

Hood Size		Equipment with Grills or Deep Fryers (Number of Exposed Sides)				Ranges and Ovens (Number of Exposed Sides)
Area (Sq. Ft.)		Four (CFM)		Three (CFM)		Four (CFM)		Three (CFM)
Up to 4		Up to 400		Up to 300		Up to 300		Up to 200
4		400		300		300		200
4.5		450		338		338		225
5		500		375		375		250
5.5		550		413		413		275
6		600		450		450		300
6.5		650		488		488		325
7		700		525		525		350
7.5		750		563		563		375
8		800		600		600		400
8.5		850		638		638		425
9		900		675		675		450
9.5		950		713		713		475
10		1,000		750		750		500
10.5		1,050		788		788		525
11		1,100		825		825		550
11.5		1,150		863		863		575
12		1,200		900		900		600
12.5		1,250		938		938		625
13		1,300		975		975		650
13.5		1,350		1,013		1,013		675
14		1,400		1,050		1,050		700
14.5		1,450		1,088		1,088		725
15		1,500		1,125		1,125		750
15.5		1,550		1,163		1,163		775
16		1,600		1,200		1,200		800

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.6012 IFGC APPENDIX E, WORKSHEET E-1.

IFGC Appendix E, Worksheet E-1

Residential Combustion Air Calculation Method

(for Furnace, Boiler, and/or Water Heater in the Same Space)

Step 1: Complete vented combustion appliance information.

Furnace/Boiler:

_	Draft Hood	_	Fan Assisted	_	Direct Vent	Input:
(Not fan assisted)		& Power Vent				_ Btu/hr
Water Heater:
_	Draft Hood	_	Fan Assisted	_	Direct Vent	Input:
(Not fan assisted)		& Power Vent				_ Btu/hr

Step 2: Calculate the volume of the Combustion Appliance Space (CAS) containing combustion appliances.

The CAS includes all spaces connected to one another by code compliant openings.

CAS volume:_______ft3

Step 3: Determine Air Changes per Hour (ACH)¹

Default ACH values have been incorporated into Table E-1 for use with Method 4b (KAIR Method). If the year of construction or ACH is not known, use method 4a (Standard Method).

Step 4: Determine Required Volume for Combustion Air.

4a. Standard Method

Total Btu/hr input of all combustion appliances (DO NOT COUNT DIRECT VENT APPLIANCES)		Input: _ Btu/hr
Use Standard Method column in Table E-1 to find Total Required Volume (TRV)		TRV: _ ft 3

If CAS Volume (from Step 2) is greater than TRV then no outdoor openings are needed.

If CAS Volume (from Step 2) is less than TRV then go to STEP 5.

4b. Known Air Infiltration Rate (KAIR) Method

Total Btu/hr input of all fan-assisted and power vent appliances (DO NOT COUNT DIRECT VENT APPLIANCES)		Input: _ Btu/hr
Use Fan-Assisted Appliances column in Table E-1 to find Required Volume Fan Assisted (RVFA)		RVFA: _ ft 3
Total Btu/hr input of all non-fan-assisted appliances		Input: _ Btu/hr
Use Non-Fan-Assisted Appliances column in Table E-1 to find Required Volume Non-Fan-Assisted (RVNFA)		RVNFA: _ ft 3

Total Required Volume (TRV) = RVFA + RVNFA
	RV = _ + _ = _ ft 3

If CAS Volume (from Step 2) is greater than TRV then no outdoor openings are needed.

If CAS Volume (from Step 2) is less than TRV then go to STEP 5.

Step 5: Calculate the ratio of available interior volume to the total required volume.

Ratio = CAS Volume (from Step 2) divided by TRV (from Step 4a or Step 4b)

Ratio = _ / _ = _

Step 6: Calculate Reduction Factor (RF).

RF = 1 minus Ratio

RF = 1 - _ = _

Step 7: Calculate single outdoor opening as if all combustion air is from outside.

Total Btu/hr input of all Combustion Appliances in the same CAS (EXCEPT DIRECT VENT)

Input: _ Btu/hr

Combustion Air Opening Area (CAOA):
Total Btu/hr divided by 3000 Btu/hr per in2
	CAOA = _ /3000 Btu/hr per in 2 = _ in 2

Step 8: Calculate Minimum CAOA.

Minimum CAOA = CAOA multiplied by RF
	Minimum CAOA = _ x _ = _ in 2

Step 9: Calculate Combustion Air Opening Diameter (CAOD)

CAOD = 1.13 multiplied by the square root of Minimum CAOA
	CAOD = 1.13 Minimum CAOA = _ in

¹If desired, ACH can be determined using ASHRAE calculation or blower door test. Follow procedures in Section G304.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009

1346.6014 IFGC APPENDIX E, TABLE E-1.

IFGC Appendix E, Table E-1

Residential Combustion Air Required Volume

(Required Interior Volume Based on Input Rating of Appliances)

		Known Air Infiltration Rate (KAIR) Method (ft3)
		Fan Assisted		Non-Fan-Assisted
Input Rating (Btu/hr)	Standard Method (ft3)	19941 to Present	Pre 19942	19941 to Present	Pre 19942
5,000	250	375	188	525	263
10,000	500	750	375	1,050	525
15,000	750	1,125	563	1,575	788
20,000	1,000	1,500	750	2,100	1,050
25,000	1,250	1,875	938	2,625	1,313
30,000	1,500	2,250	1,125	3,150	1,575
35,000	1,750	2,625	1,313	3,675	1,838
40,000	2,000	3,000	1,500	4,200	2,100
45,000	2,250	3,375	1,688	4,725	2,363
50,000	2,500	3,750	1,875	5,250	2,625
55,000	2,750	4,125	2,063	5,775	2,888
60,000	3,000	4,500	2,250	6,300	3,150
65,000	3,250	4,875	2,438	6,825	3,413
70,000	3,500	5,250	2,625	7,350	3,675
75,000	3,750	5,625	2,813	7,875	3,938
80,000	4,000	6,000	3,000	8,400	4,200
85,000	4,250	6,375	3,188	8,925	4,463
90,000	4,500	6,750	3,375	9,450	4,725
95,000	4,750	7,125	3,563	9,975	4,988
100,000	5,000	7,500	3,750	10,500	5,250
105,000	5,250	7,875	3,938	11,025	5,513
110,000	5,500	8,250	4,125	11,550	5,775
115,000	5,750	8,625	4,313	12,075	6,038
120,000	6,000	9,000	4,500	12,600	6,300
125,000	6,250	9,375	4,688	13,125	6,563
130,000	6,500	9,750	4,875	13,650	6,825
135,000	6,750	10,125	5,063	14,175	7,088
140,000	7,000	10,500	5,250	14,700	7,350
145,000	7,250	10,875	5,438	15,225	7,613
150,000	7,500	11,250	5,625	15,750	7,875
155,000	7,750	11,625	5,813	16,275	8,138
160,000	8,000	12,000	6,000	16,800	8,400
165,000	8,250	12,375	6,188	17,325	8,663
170,000	8,500	12,750	6,375	17,850	8,925
175,000	8,750	13,125	6,563	18,375	9,188
180,000	9,000	13,500	6,750	18,900	9,450
185,000	9,250	13,875	6,938	19,425	9,713
190,000	9,500	14,250	7,125	19,950	9,975
195,000	9,750	14,625	7,313	20,475	10,238
200,000	10,000	15,000	7,500	21,000	10,500
205,000	10,250	15,375	7,688	21,525	10,763
210,000	10,500	15,750	7,875	22,050	11,025
215,000	10,750	16,125	8,063	22,575	11,288
220,000	11,000	16,500	8,250	23,100	11,550
225,000	11,250	16,875	8,438	23,625	11,813
230,000	11,500	17,250	8,625	24,150	12,075

¹The 1994 date refers to dwellings constructed under the 1994 Minnesota Energy Code. The default KAIR used in this section of the table is 0.20 ACH.

²This section of the table is to be used for dwellings constructed prior to 1994. The default KAIR used in this section of the table is 0.40 ACH.

Statutory Authority:

MS s 326B.101; 326B.106; 326B.13

History:

34 SR 537

Published Electronically:

October 23, 2009