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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 camping unit.
b. For the purpose of complying with this subdivision, naturally vented space-heating or water-heating appliances are those that take combustion or dilution air from inside the camping unit, including unsealed fireplaces and draft hood appliances with power venting.
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.
(c) Rooms with toilets, tubs, or showers. 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.
(3) Controls. The temperature rise through the equipment shall not exceed 100 degrees Fahrenheit 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.
History: EmR1703: emerg. cr., eff. 2-6-17; CR 17-017: cr. Register March 2018 No. 747, eff. 4-1-18.
SPS 327.39 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.
History: EmR1703: emerg. cr., eff. 2-6-17; CR 17-017: cr. Register March 2018 No. 747, eff. 4-1-18.
SPS 327.40 Types and location of equipment.
(1) General.
(a) All heat producing appliances and cooling appliances shall be listed by a testing agency acceptable to the department.
(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 subchapter.
(2) Furnaces.
(a) 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.
(b) Furnaces shall be fired with the fuel for which they have been approved. Fuels shall be supplied to the furnace in the volume and at the pressure required on the label.
(3) Water heaters.
(a) A water heater with a tank may be installed in a closet located in a bathroom or bedroom where the closet is used exclusively for the water heater, where the enclosed space has a weather-stripped solid door with a self-closing device, and where all air for combustion is obtained from the outdoors.
Note: Section SPS 327.41 still requires combustion air to be provided to the appliance.
(b) A tankless water heater may be installed in any closet or cabinet. The tankless water heater shall be installed in accordance with the manufacturer’s installation instructions.
History: EmR1703: emerg. cr., eff. 2-6-17; CR 17-017: cr. Register March 2018 No. 747, eff. 4-1-18.
SPS 327.41 Combustion air.
(1) Scope.
(a) Naturally vented appliances and other appliances that require air for combustion and dilution of flue gases to be taken from within the camping unit shall comply with this section.
(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.
(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.
(d) Listed fireplace stoves are not required to comply with this section if permitted in the manufacturer’s instructions.
(e) Listed factory-built fireplaces shall comply with the manufacturer’s recommendations.
(2) Methods for providing air. Air for combustion and dilution shall be provided in accordance with one of the following:
(a) Air may be provided from inside the camping unit in accordance with sub. (3).
(b) Air may be provided from outside the camping unit in accordance with sub. (4).
(c) The appliance may be installed in accordance with its listing and manufacturer’s instructions.
(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.
(3) Air from inside the camping unit.
(a)
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.
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).
(b)
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.
2. The net free area of openings shall be calculated in accordance with sub. (5).
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.
(4) Air from outside the camping unit.
(a) When air for combustion and dilution is provided from outside the camping unit, as allowed under sub. (2) (b), one of the methods specified in pars. (b) to (d) shall be used.
(b) Openings may be provided to connect rooms containing appliances to the outdoors.
1.
a. Two openings shall be provided, one within one foot of the ceiling of the room and one within one foot of the floor.
b. Openings may connect directly to the outdoors or to the outdoors through a horizontal or vertical duct.
c. The net free area of openings shall be calculated in accordance with sub. (5).
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.
3.
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.
b. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.
4.
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.
b. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.
(c)
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.
2.
a. The opening shall be located within one foot of the ceiling of the room.
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.
c. The net free area of the opening shall be calculated in accordance with sub. (5).
3.
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.
b. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.
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.
(d)
1. A combination of openings to the outside and openings to other rooms may be used in accordance with this paragraph.
2.
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.
b. The net free area of the openings shall be calculated in accordance with sub. (5).
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.
d. The cross-sectional area of a duct, if used, shall be equal to or greater than the required size of the opening.
3.
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.
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.
4.
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.
b. The net free area of openings shall be calculated in accordance with sub. (5).
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.
(5) Net free area calculation.
(a) The required size of openings for combustion and dilution air shall be based on the net free area of each opening.
(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.
(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.
History: EmR1703: emerg. cr., eff. 2-6-17; CR 17-017: cr. Register March 2018 No. 747, eff. 4-1-18.
SPS 327.42 Mechanical 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.
History: EmR1703: emerg. cr., eff. 2-6-17; CR 17-017: cr. Register March 2018 No. 747, eff. 4-1-18.
SPS 327.43 Equipment 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.
History: EmR1703: emerg. cr., eff. 2-6-17; CR 17-017: cr. Register March 2018 No. 747, eff. 4-1-18.
SPS 327.44 Ductwork.
(1) Duct use. Ducts designed for the transmission of air shall be used for no other purpose.
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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.