Subchapter III — Heating Equipment
SPS 323.03 Selection of equipment.
SPS 323.04 Types and location of equipment.
SPS 323.045 Solid-fuel-burning appliances.
SPS 323.05 Safety controls.
SPS 323.06 Combustion air.
SPS 323.062 Mechanical draft systems.
SPS 323.065 Equipment maintenance information.
Subchapter IV — Delivery Systems
SPS 323.07 Air distribution systems.
SPS 323.09 Dampers, registers and grilles.
Subchapter V — Chimneys and Vents
SPS 323.11 General requirements.
SPS 323.12 Masonry chimneys.
SPS 323.13 Factory-built chimneys or vents.
SPS 323.15 Chimney connectors, smoke pipes and stovepipes.
SPS 323.155 Multiple appliance venting.
SPS 323.156 Condensate drains.
Subchapter VI — Fuel Supply Systems
Subchapter VII — Equipment Location and Operation
SPS 323.17 Equipment location.
Ch. SPS 323 Note
Note: Chapter Ind 23 was renumbered to be chapter ILHR 23,
Register, February, 1985, No. 350, eff. 3-1-85. Chapter ILHR 23 was renumbered Chapter Comm 23 under s. 13.93 (2m) (b) 1., Stats., and corrections made under s. 13.93 (2m) (b) 7., Stats.,
Register, January, 1999, No. 517. Chapter Comm 23 was renumbered chapter SPS 323 under s. 13.92 (4) (b) 1., Stats.,
Register December 2011 No. 672.
SPS 323.01
SPS 323.01
Scope. The provisions of this chapter shall apply to the design, installation and construction of all heating, ventilating and air conditioning systems in dwellings covered by this code.
SPS 323.01 History
History: Cr.
Register, November, 1979, No. 287, eff. 6-1-80.
SPS 323.02
SPS 323.02
Design. Every dwelling shall be equipped with a heating system designed in accordance with this section. Heating equipment requirements may be waived for recreational dwellings used only during the non-heating season. Where a cooling system is provided, the cooling requirements of this section shall be met.
SPS 323.02(1)(a)(a) The heating and cooling systems shall be designed to maintain the indoor design temperature at outdoor design conditions.
SPS 323.02(1)(b)
(b) When requested, room-by-room heat loss and heat gain calculations shall be furnished.
SPS 323.02 Note
Note: See Appendix for outdoor design temperature map.
SPS 323.02(2)
(2) Distribution systems. Distribution systems shall be sized and located to satisfy the heating and cooling loads of each conditioned space. When requested, a layout of the distribution system shall be furnished to show that the system meets the requirements of this code.
SPS 323.02(3)(a)2.
2. Automatic or gravity dampers that close when the system is not operating shall be provided for outdoor air intake and exhaust.
SPS 323.02(3)(b)1.1. General. Except as provided under
subd. 2., mechanical ventilation systems shall be balanced.
SPS 323.02(3)(b)2.
2. Exception. Passive intake air ducts providing makeup air for intermittent exhaust fans shall be sized to provide at least 40% of the total air that would be exhausted with all intermittent exhaust ventilation in the dwelling operating simultaneously.
SPS 323.02(3)(b)3.a.a. Kitchen range hoods that exhaust air from the kitchen area are considered as exhaust ventilation for balancing and makeup purposes.
SPS 323.02(3)(b)3.b.
b. Kitchen range hoods that are listed and installed to recirculate air without exhausting it are not required to be balanced.
SPS 323.02(3)(b)4.a.a. Infiltration may be considered as makeup air for balancing purposes only where there are no naturally vented space- or water-heating appliances in the dwelling.
SPS 323.02(3)(b)4.b.
b. For the purpose of complying with this subdivision, naturally vented space- or water-heating appliances are those that take combustion or dilution air from inside the dwelling, including unsealed fireplaces and draft hood appliances with power venting.
SPS 323.02 Note
Note: Whole-house fans that are used in the summer to bring cool night air in through open windows and exhaust into the attic are considered to be a supplemental cooling system rather than part of the ventilation system.
SPS 323.02 Note
Note: See s.
SPS 322.39 (5) for additional requirements on mechanical ventilation.
SPS 323.02(3)(c)
(c) Habitable rooms. Habitable rooms without openable windows shall be provided with a balanced mechanical ventilation system producing one air change per hour of fresh outside air while the room is occupied.
SPS 323.02(3)(d)1.1. Except as provided under
subd. 2., any room with a toilet, tub or shower shall be provided with exhaust ventilation capable of exhausting 50 cubic feet per minute on an intermittent basis or 20 cubic feet on a continuous basis.
SPS 323.02(3)(d)2.
2. For dwellings with no electrical service, any room with a toilet, tub or shower shall be provided with an openable window.
SPS 323.02 Note
Note: The department will accept designs which meet the Air Conditioning Contractors of America manual; the Mechanical Contractors Association manual; and the Sheet Metal and Air Conditioning Contractors National Association standards for heating and air conditioning systems for one- and 2-family dwellings.
SPS 323.02(4)
(4) Controls. The temperature rise through the equipment shall not exceed 100
° F unless listed. Controls shall be provided to maintain the inside temperature. Where forced, warm-air systems are used, controls shall be installed to control air movement.
SPS 323.02 History
History: Cr.
Register, November, 1979, No. 287, eff. 6-1-80; am. (1)
Register, January, 1989, No. 397, eff. 2-1-89; am. (3),
Register, March, 1992, No. 435, eff. 4-1-92
; r. and recr. (3),
Register, November, 1995, No. 479, eff. 12-1-95; r. and recr. (1) and (3) (a),
Register, January, 1999, No. 517, eff. 2-1-99; r. and recr. (3) (a), renum. (3) (b) and (c) to be (3) (c) and (d), and cr. (3) (b),
Register, March, 2001, No. 543, eff. 4-1-01;
CR 08-043: r. (1) (a), renum. (1) (b), (c) and (3) (a) to be (1) (a), (b) and (3) (a) 1., cr. (3) (a) 2., am. (3) (d)
Register March 2009 No. 639, eff. 4-1-09.
SPS 323.03
SPS 323.03
Selection of equipment. All heating and central cooling equipment shall be selected on the basis of air-handling capacity, pumping capacity, and thermal capacity to handle the calculated design heating or cooling load.
SPS 323.03 History
History: Cr.
Register, November, 1979, No. 287, eff. 6-1-80.
SPS 323.04
SPS 323.04
Types and location of equipment. SPS 323.04(1)(a)(a) All heat producing appliances and cooling appliances shall be listed by a testing agency acceptable to the department.
SPS 323.04(1)(b)
(b) Installation and maintenance of gas-fueled appliances shall comply with the appliance listing and the requirements of NFPA 54, National Fuel Gas Code, except as otherwise required under this chapter.
SPS 323.04(1)(c)
(c) The clearances from combustible materials in Tables 323.04-A and 323.04-B shall apply unless otherwise shown on listed appliances.
TABLE 323.04-A
STANDARD INSTALLATION CLEARANCES (INCHES) FOR HEAT-PRODUCING APPLIANCES
- See PDF for table 
SPS 323.04 Note
1 Standard clearances may be reduced by affording protection to combustible material in accordance with Table 323.04-B.
SPS 323.04 Note
2 Rooms which are large in comparison to the size of the appliance are those having a volume equal to at least 12 times the total volume of a furnace and at least 16 times the total volume of a boiler. If the actual ceiling height of a room is greater than 8 feet, the volume of a room should be figured on the basis of a ceiling height of 8 feet.
SPS 323.04 Note
3 The minimum dimension should be that necessary for servicing the appliance including access for cleaning and normal care, tube removal, etc.
SPS 323.04 Note
4 For a listed oil, combination gas-oil, gas, or electric furnace this dimension may be 2 inches if the furnace limit control cannot be set higher than 250° F or this dimension may be one inch if the limit control cannot be set higher than 200
° F.
SPS 323.04 Note
5 To combustible material or metal cabinets. If the underside of such combustible material or metal cabinet is protected with asbestos millboard at least 1/4-inch thick covered with sheet metal of not less than No. 28 gauge, the distance may be not less than 24 inches. Also, if the manufacturer of the range, cooktop, or cooking stove specifies a shorter clearance, that clearance may be used instead.
SPS 323.04 Note
6 Clearance above charging door should be not less than 48 inches.
TABLE 323.04-B
SPS 323.04 Note
*All clearances shall be measured from the outer surface of the equipment to the combustible material disregarding any intervening protection applied to the combustible material.
SPS 323.04 Note
**A factory fabricated board formed with noncombustible materials, normally fibers, and having a thermal conductivity in the range of 1 Btu inch per square foot per °F, or less.
SPS 323.04 Note
***Spacers shall be of noncombustible material.
SPS 323.04(2)
(2) Furnaces. The input and output capacity of furnaces shall be listed on the nameplate. All nameplates shall show evidence that the equipment has been listed by a recognized testing laboratory.
SPS 323.04(2)(a)
(a) Fuel supply. Furnaces shall be fired with the fuel for which they have been approved, except as provided in
par. (d). Fuels shall be supplied to the furnace in the volume and at the pressure required on the label.
SPS 323.04(2)(b)
(b) Unvented furnaces and space heaters. The use of unvented furnaces and space heaters fueled by natural gas, kerosene, alcohol or other fuel shall be prohibited due to concerns about oxygen depletion; contamination from carbon monoxide, carbon dioxide, nitrogen dioxide, formaldehyde and other combustion related contaminants; and water vapor buildups.
SPS 323.04(2)(c)
(c) Vented wall furnaces. Vented wall furnaces shall not be equipped with duct extensions beyond the vertical and horizontal limits of the enclosure unless listed. Vented wall furnaces shall be located to prevent the restriction of air circulation by doors, projections, or other openings. Vented wall furnaces shall be provided with combustion air.
SPS 323.04(2)(d)
(d) Conversion burners. Conversion burners shall be listed by a recognized testing laboratory. The existing equipment shall be reconditioned and defective parts replaced before a conversion burner is installed. Conversion burners shall be installed in accordance with the installation instructions.
SPS 323.04(3)(a)(a) Size. Heat pump appliances shall be sized to provide control of the wet and dry bulb temperatures during cooling and maximum performance during heating. The heating balance point shall be considered to determine the outdoor temperature at which the heat pump must operate 100% of the time to offset the dwelling heat loss.
SPS 323.04(3)(b)
(b) Auxiliary heaters. Provisions for auxiliary heat to supplement the heat pump at outdoor temperatures below the balance point shall be provided. Auxiliary heaters shall be sized so that the heat pump auxiliary will offset the dwelling heat loss down to the heating design temperature.
