SPS 323.06(1)(a)(a) Naturally vented appliances and other appliances that require air for combustion and dilution of flue gases to be taken from within the building shall comply with this section.
SPS 323.06(1)(b) (b) Appliances that are provided with a direct supply of outside air for combustion in accordance with the manufacturer's installation instructions and listing are not required to comply with this section.
SPS 323.06(1)(c) (c) Where the appliance listing and manufacturer's instructions are more stringent than the provisions of this section, the listing and manufacturer's instructions apply.
SPS 323.06(1)(d) (d) Listed fireplace stoves are not required to comply with this section if permitted in the manufacturer's instructions.
SPS 323.06(1)(e) (e) Masonry fireplaces shall conform to the requirements of s. SPS 321.29.
SPS 323.06(1)(f) (f) Listed factory-built fireplaces shall comply with the manufacturer's recommendations and shall conform with the requirements of s. SPS 321.32.
SPS 323.06(2) (2)Methods for providing air. Air for combustion and dilution shall be provided in accordance with one of the following:
SPS 323.06(2)(a) (a) If the vapor retarder is not continuous on walls and ceilings exposed to the outside atmosphere as allowed by s. SPS 322.38, air may be provided from inside the building in accordance with sub. (3).
SPS 323.06(2)(b) (b) Air may be provided from outside the building in accordance with sub. (4).
SPS 323.06(2)(c) (c) The appliance may be installed in accordance with its listing and manufacturer's instructions. Where all walls and ceilings exposed to the outside atmosphere are provided with a continuous vapor retarder, any requirements for unusually tight construction shall be met.
SPS 323.06(2)(d) (d) An engineered system providing an adequate supply of air for combustion ventilation and dilution of flue gases may be installed if approved by the department.
SPS 323.06(3) (3)Air from inside the building.
SPS 323.06(3)(a)1.1. The equipment shall be located in a space with a volume not less than 50 cubic feet per 1000 Btu/h of the combined input rating of all fuel-burning appliances drawing combustion and dilution air from that space.
SPS 323.06(3)(a)2. 2. The space may be made up of more than one room if the rooms are connected through doorways without doors or connected through sets of openings described in par. (b).
SPS 323.06(3)(b)1.1. When needed to connect rooms, two openings shall be provided, one within one foot of the ceiling of the room and one within one foot of the floor.
SPS 323.06(3)(b)2. 2. The net free area of openings shall be calculated in accordance with sub. (5).
SPS 323.06(3)(b)3. 3. The net free area of each opening shall be a minimum of one square inch per 1000 Btu/h of combined input rating of the fuel burning appliances drawing combustion and dilution air from the communicating rooms, but shall be not less than 100 square inches.
SPS 323.06(4) (4)Air from outside the building.
SPS 323.06(4)(a)(a) When air for combustion and dilution is provided from outside the building, as allowed under sub. (2) (b), one of the methods specified in pars. (b) to (d) shall be used.
SPS 323.06(4)(b) (b) Openings may be provided to connect rooms containing appliances to the outdoors.
SPS 323.06(4)(b)1.a.a. Two openings shall be provided, one within one foot of the ceiling of the room and one within one foot of the floor.
SPS 323.06(4)(b)1.b. b. Openings may connect directly to the outdoors or to the outdoors through a horizontal or vertical duct.
SPS 323.06(4)(b)1.c. c. The net free area of openings shall be calculated in accordance with sub. (5).
SPS 323.06(4)(b)2. 2. The net free area of each direct opening to the outdoors not using a duct shall be a minimum of one square inch per 4000 Btu/h of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room.
SPS 323.06(4)(b)3.a.a. The net free area of each opening connected to the outdoors through a horizontal duct shall be a minimum of one square inch per 2000 Btu/h of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room.
SPS 323.06(4)(b)3.b. b. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.
SPS 323.06(4)(b)4.a.a. The net free area of each opening connected to the outdoors through a vertical duct shall be a minimum of one square inch per 4000 Btu/h of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room.
SPS 323.06(4)(b)4.b. b. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.
SPS 323.06(4)(c)1.1. Where all appliances drawing air for combustion and dilution from the room are gas appliances, air may be provided via a single opening to connect the room to the outdoors in accordance with this paragraph.
SPS 323.06(4)(c)2.a.a. The opening shall be located within one foot of the ceiling of the room.
SPS 323.06(4)(c)2.b. b. The opening may connect directly to the outdoors, may connect to the outdoors through a horizontal duct, or may connect to the outdoors through a vertical duct.
SPS 323.06(4)(c)2.c. c. The net free area of the opening shall be calculated in accordance with sub. (5).
SPS 323.06(4)(c)3.a.a. The net free area of the opening shall be a minimum of one square inch per 3000 Btu/h of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room, and not less than the combined cross-sectional flow areas of the appliance flue collars or draft hood outlets.
SPS 323.06(4)(c)3.b. b. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.
SPS 323.06(4)(c)4. 4. The appliances shall have a minimum clearance to the surfaces of the room of one inch at the sides and back of the appliance and 6 inches at the front of the appliance.
SPS 323.06(4)(d)1.1. A combination of openings to the outside and openings to other rooms may be used in accordance with this paragraph.
SPS 323.06(4)(d)2.a.a. One opening shall connect directly to the outdoors, connect to the outdoors through a horizontal duct, or connect to the outdoors through a vertical duct.
SPS 323.06(4)(d)2.b. b. The net free area of the openings shall be calculated in accordance with sub. (5).
SPS 323.06(4)(d)2.c. c. The net free area of the opening shall be a minimum of one square inch per 5000 Btu/h of combined input rating of the fuel burning appliances drawing combustion and dilution air from the room.
SPS 323.06(4)(d)2.d. d. The cross-sectional area of a duct, if used, shall be equal to or greater than the required size of the opening.
SPS 323.06(4)(d)3.a.a. The equipment shall be located in a space with a volume not less than 50 cubic feet per 1000 Btu/h of the combined input rating of all fuel-burning appliances installed in that space.
SPS 323.06(4)(d)3.b. b. The space may be made up of more than one room if the rooms are connected through openings without doors or connected through sets of openings described in subd. 4.
SPS 323.06(4)(d)4.a.a. When needed to connect rooms, two openings shall be provided, one within one foot of the ceiling of the room and one within one foot of the floor.
SPS 323.06(4)(d)4.b. b. The net free area of openings shall be calculated in accordance with sub. (5).
SPS 323.06(4)(d)4.c. c. The net free area of each opening shall be a minimum of one square inch per 1000 Btu/h of combined input rating of the fuel burning appliances drawing combustion and dilution air from the communicating rooms, but shall be not less than 100 square inches.
SPS 323.06(5) (5)Net free area calculation.
SPS 323.06(5)(a)(a) The required size of openings for combustion and dilution air shall be based on the net free area of each opening.
SPS 323.06(5)(b) (b) The net free area of an opening shall be that specified by the manufacturer of the opening covering or by a source approved by the department.
SPS 323.06(5)(c) (c) In the absence of such information, openings covered with metal louvers shall be deemed to have a net free area of 75 percent of the area of the opening, and openings covered with wood louvers shall be deemed to have a net free area of 25 percent of the area of the opening.
SPS 323.06(6) (6)Interlocking of dampers.
SPS 323.06(6)(a)(a) Where the combustion air openings are provided with volume, smoke or fire dampers, the dampers shall be electronically interlocked with the firing cycle of the appliances served, so as to prevent operation of any appliance that draws combustion and dilution air from the room when any of the dampers are closed.
SPS 323.06(6)(b) (b) Manually operated dampers shall not be installed in combustion air openings.
SPS 323.06(7) (7)Simultaneous operation.
SPS 323.06(7)(a)(a) The equipment and appliance within every room containing fuel-burning appliances shall be installed so as to allow the free circulation of air.
SPS 323.06(7)(b) (b) Provisions shall be made to allow for the simultaneous operation of mechanical exhaust systems, fireplaces, clothes dryers or other equipment and appliances operating in the same room or space from which combustion air and dilution air is being drawn. The provisions shall prevent the operation of the appliances, equipment and systems from affecting the supply of combustion and dilution air.
SPS 323.06 Note Note: Wood typically has a heating value of 8600 BTU per pound.
SPS 323.06 History History: Cr. Register, November, 1979, No. 287, eff. 6-1-80; am. (intro.), (1) (a) and (2) (a), Register, January, 1989, No. 397, eff. 2-1-89; r. and recr. Register, March, 2001, No. 543, eff. 4-1-01; correction in (2) (a) made under s. 13.92 (4) (b) 7., Stats., Register March 2009 No. 639; correction (2) (a) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672; CR 15-041: cr. (1) (d) to (f) Register December 2015 No. 720, eff. 1-1-16.
SPS 323.062 SPS 323.062Mechanical draft systems. Where a mechanical draft system, such as a fan is used, provision shall be made to prevent the flow of gas to the main burners when the draft system is not performing so as to satisfy the operating requirements of the system for safe performance.
SPS 323.062 History History: Cr. Register, March, 2001, No. 543, eff. 4-1-01.
SPS 323.065 SPS 323.065Equipment maintenance information. Required regular maintenance actions for equipment shall be clearly stated and incorporated on a readily accessible label. The label may be limited to identifying, by title or publication number, the operation and maintenance manual for that particular model and type of equipment. Maintenance instructions shall be furnished for equipment which requires preventive maintenance for efficient operation. Manufacturer's manuals for all installed heating and cooling equipment and service water heating equipment shall be provided.
SPS 323.065 History History: Cr., Register, January, 1999, No. 517, eff. 2-1-99.
subch. IV of ch. SPS 323 Subchapter IV — Delivery Systems
SPS 323.07 SPS 323.07Air distribution systems.
SPS 323.07(1) (1)Sizing. All air distribution systems shall be sized using the velocities and static pressure losses listed in Table 323.07.
TABLE 323.07
DUCT VELOCITIES - See PDF for table PDF
SPS 323.07(2) (2)System sizing. The distribution system, including the evaporator coil, air filters (installed external to the heating unit), ducts, fittings, grilles and registers, shall be sized so that the total external static pressure shall not exceed the static pressure capacity of the fan at the system rated air flow.
SPS 323.07(3) (3)Changes in duct size. Where duct sizes are changed, the slope angle of the transition duct shall not exceed 45°.
SPS 323.07 History History: Cr. Register, November, 1979, No. 287 eff. 6-1-80; correction in (1) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 323.08 SPS 323.08Ductwork.
SPS 323.08(1) (1)Duct use. Ducts designed for the transmission of air shall be used for no other purpose.
SPS 323.08(2) (2)Interior ducts. All interior ducts shall be constructed in accordance with the following:
SPS 323.08(2)(a) (a) Supply and return air ducts. Supply and return air ducts shall comply with this paragraph except that ducts attached to appliances may be constructed of materials specified in the appliance listing.
SPS 323.08(2)(a)1. 1. Kitchen exhaust ducts and ducts for air exceeding 250° F shall be constructed of sheet metal or lined with sheet metal or constructed of other noncombustible noncorrugated materials.
SPS 323.08(2)(a)2. 2. Ducts connected to furnaces shall be constructed of sheet metal for at least 6 feet from the furnace.
SPS 323.08(2)(a)3. 3. Spaces formed by unlined wood joists, studs or wood I-joists with solid webs may be used as return air ducts. Spaces used as return air ducts shall be cut off from all remaining unused portions of the space by tight-fitting stops of sheet metal or of wood joist material. Bridging shall be removed from the joist space.
SPS 323.08(2)(b) (b) Under-floor plenums. An under-floor space may be used as a plenum in a single dwelling unit in accordance with this section.
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.