Section 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.

(1)   Heating and cooling system design.

(a) The heating and cooling systems shall be designed to maintain the indoor design temperature at outdoor design conditions.

(b) When requested, room-by-room heat loss and heat gain calculations shall be furnished.

(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.

(3)   Ventilation.

(a) General.

1. All exhaust vents shall terminate outside the structure.

2. Automatic or gravity dampers that close when the system is not operating shall be provided for outdoor air intake and exhaust.

(b) Balancing.

1. General. Except as provided under subd. 2. , mechanical ventilation systems shall be balanced.

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.

3. Kitchen range hoods.

a. Kitchen range hoods that exhaust air from the kitchen area are considered as exhaust ventilation for balancing and makeup purposes.

b. Kitchen range hoods that are listed and installed to recirculate air without exhausting it are not required to be balanced.

4. Infiltration.

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.

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.

(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.

(d) Rooms with toilets, tubs or showers.

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.

2. For dwellings with no electrical service, any room with a toilet, tub or shower shall be provided with an openable window.

(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.

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.

Note

See Appendix for outdoor design temperature map. Microsoft Windows NT 6.1.7601 Service Pack 1 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. Microsoft Windows NT 6.1.7601 Service Pack 1 See s. SPS 322.39 (5) for additional requirements on mechanical ventilation. Microsoft Windows NT 6.1.7601 Service Pack 1 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. Microsoft Windows NT 6.1.7601 Service Pack 1