SPS 323.08(3)(a)(a) General. Except as provided in par. (b), ducts, which are located in garages, storage attics and similar spaces susceptible to physical damage, shall be constructed of galvanized steel or corrosion-resistive metal.
SPS 323.08(3)(b) (b) Exception. Plastic may be used for bath fan or air-to-air heat exchanger exhaust runs located in spaces outside the dwelling.
SPS 323.08(4) (4)Underground ducts. Ducts, plenums and fittings constructed of metal encased in concrete or ceramic, or other approved materials, may be installed in the ground. Encasement of underground supply air ducts shall be moistureproof.
SPS 323.08 Note Note: See s. SPS 322.42 for insulation requirements for underground ducts.
SPS 323.08(5) (5)Duct construction. Ductwork shall be constructed and installed in accordance with any one of the appropriate following standards:
SPS 323.08(5)(a) (a) ASHRAE Handbook HVAC Systems and Equipment.
SPS 323.08(5)(b) (b) SMACNA, Residential Comfort System Installation Standards Manual
SPS 323.08(5)(c) (c) SMACNA, HVAC Duct Construction Standards-Metal and Flexible.
SPS 323.08(5)(d) (d) SMACNA Fibrous Glass Duct Construction Standards.
SPS 323.08(5)(e) (e) ASHRAE HVAC Applications Handbook.
SPS 323.08(5)(f) (f) NAIMA Fibrous Glass Duct Construction Standards. 
SPS 323.08(6) (6)Thickness. Sheet metal ducts shall conform to the minimum thicknesses listed in Table 323.08-A.
SPS 323.08(7) (7)Duct support. Rigid metal ductwork shall be supported in accordance with Table 323.08-B.
TABLE 323.08-A
DUCT CONSTRUCTION MINIMUM
SHEET METAL GAUGES - See PDF for table PDF
TABLE 323.08-B
DUCT SUPPORT FOR RIGID DUCTS —
16 GAGE MAXIMUM THICKNESS - See PDF for table PDF
1   These hangers are the minimum required to support the weight of the duct off of the joist, stud or similar structure. The band, wire or strap cradling the duct shall not cause any deformation of the duct.
2   “Pair" means that there are 2 vertical legs. One continuous strap can form both vertical legs.
SPS 323.08 Note Note: This table does not prohibit nailing for duct support.
SPS 323.08(8) (8)Joints and seams. All joints and seams shall be securely fastened or locked. Round pipe slip joints shall be lapped at least one inch.
SPS 323.08(9) (9)Vibration control. When used, vibration isolation connectors shall be installed at the joint between the duct and fan or heating equipment. Vibration isolation connectors shall not be used where the air temperature is in excess of 250° F.
SPS 323.08(10) (10)Air passageways of envelope dwellings. The air passageways of envelope type dwellings shall comply with this subsection.
SPS 323.08(10)(a) (a) No heating equipment shall be placed in the air passageways.
SPS 323.08(10)(b) (b) Wood exposed to the air passageways shall be of at least 2 inches nominal thickness.
SPS 323.08(10)(c) (c) Finishes and insulation exposed to the air passageway shall have a flame spread rating of 25 or less and a smoke development rating of 50 or less.
SPS 323.08(10)(d) (d) A vapor barrier shall be installed on the warm side of insulation which forms a part of the thermal envelope of the dwelling. In the roof-ceiling air passageway, a vapor barrier for the insulation of the ceiling may be omitted if heated air is circulated on both sides of the ceiling insulation. The insulation on the roof side of the air passageway shall be provided with a vapor barrier on the warm side of the insulation. Any vapor barrier exposed to circulating air shall have a flame spread rating of 25 or less and a smoke development rating of 50 or less.
SPS 323.08 History History: Cr. Register, November, 1979, No. 287, eff. 6-1-80; cr. (2) (b) and (10), Register, January, 1989, No. 397, eff. 2-1-89; r. and recr. (2) (a), am. (3) and (6), Register, March, 1992, No. 435, eff. 4-1-92; am. (2) (a) 3., (2) (b) 15., (3) (a), and (4), Register, November, 1995, No. 479, eff. 12-1-95; r. and recr. (2) (b) 15. and (5), Register, January, 1999, No. 517, eff. 2-1-99; CR 08-043: r. and recr. (7) and Table 23.08-B Register March 2009 No. 639, eff. 4-1-09; correction in (2) (b) 15. made under s. 13.92 (4) (b) 7., Stats., Register March 2009 No. 639; CR 09-104: am. (4) Register December 2010 No. 660, eff. 1-1-11; correction in (2) (b) 15., (6), (7) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 323.09 SPS 323.09Dampers, registers and grilles.
SPS 323.09(1) (1)Volume and backdraft dampers.
SPS 323.09(1)(a)(a) Volume duct dampers shall be provided to permit balancing of the system.
SPS 323.09(1)(b) (b) Volume dampers shall be provided with access.
SPS 323.09 Note Note: Acceptable means of access include a manufactured access panel, an air grille used as a cover, a plastic ceiling cap or a damper accessible through an air diffuser or grille.
SPS 323.09(1)(c) (c) Supply ducts may not terminate in a garage unless a backdraft damper is provided.
SPS 323.09(2) (2)Air registers and grilles.
SPS 323.09(2)(a)(a) Supply air registers. All supply air outlets shall be provided with registers or devices which will provide a uniform distribution of air.
SPS 323.09(2)(b) (b) Return air grilles. Return air grilles shall not be located in bathrooms, kitchens, garages, utility spaces or a confined space in which a draft diverter or draft regulator is located. All other habitable spaces shall have permanent openings to a return air grille equal in area to the supply outlet serving those areas. At least one return air opening shall be provided for each floor.
SPS 323.09 History History: Cr. Register, November, 1979, No. 287, eff. 6-1-80; CR 08-043: renum. (1) to (1) (a), cr. (1) (b) Register March 2009 No. 639, eff. 4-1-09.
SPS 323.10 SPS 323.10Piping.
SPS 323.10(1) (1)Pipe sizes and arrangement. All steam and hot water supply and return piping, air-line piping and auxiliary equipment shall be of appropriate sizes, elevations and arrangements to accomplish the calculated results without stress or other detriment.
SPS 323.10 Note Note: The sizes of pipe to be used for mains and risers may be selected from the ASHRAE Guide and Data Book, published by the American Society of Heating, Refrigerating and Air Conditioning Engineers; or the manuals published by the Institute of Boiler and Radiator Manufacturers or the Mechanical Contractors Association of America.
SPS 323.10(2) (2)Expansion and contraction. The piping for the heating system shall be equipped with anchors, expansion swings or joints, supports and similar devices to relieve stress and strain caused by temperature change of the pipe material.
SPS 323.10(3) (3)Pipe insulation. Unguarded steam, hot water supply and return piping shall be covered with insulating material where the pipes pass through occupied areas and the surface temperature exceeds 180° F.
SPS 323.10(4) (4)Steam and hot water pipes. No pipe carrying hot water or steam at a surface temperature exceeding 250° F shall be placed within one inch of any combustible material, pass through a combustible floor, ceiling or partition unless the pipe is protected by a metal sleeve one inch larger in diameter than the pipe or with approved pipe covering.
SPS 323.10(5) (5)Balancing. Balancing cocks shall be provided in each circuit of a hot water distribution system.
SPS 323.10 History History: Cr. Register, November, 1979, No. 287, eff. 6-1-80.
subch. V of ch. SPS 323 Subchapter V — Chimneys and Vents
SPS 323.11 SPS 323.11General requirements.
SPS 323.11(1) (1)Types of chimneys and vents. All heating appliances using solid, liquid or gas fuels shall be vented to the outside by an all-fuel factory-built, masonry chimney or other listed venting system designed to remove the products of combustion.
SPS 323.11(2) (2)Termination.
SPS 323.11(2)(a)(a) Chimneys. All listed factory manufactured chimneys depending on a principle of gravity for the removal of the products of combustion shall terminate at the location specified in the product listing. For masonry chimneys or where termination location is not specified as a part of the listing, the chimney shall extend at least 3 feet above the highest point where the chimney passes through the roof of the building, and at least 2 feet higher than any ridge, peak, wall, or roof within 10 feet horizontally of the chimney.
SPS 323.11(2)(b) (b) Vents. Gas and oil appliance vents shall terminate in locations specified in their listings.
SPS 323.11(3) (3)Sizing. Vents for new or replacement equipment shall be sized to adequately exhaust combustion products from the dwelling.
SPS 323.11 Note Note: The department recommends vent sizing in accordance with NFPA 54, National Fuel Gas Code or its appendix.
SPS 323.11 History History: Cr. Register, November, 1979, No. 287, eff. 6-1-80; renum. (intro) to (2) to be (1) to (3) and am. (1), Register, February, 1985, No. 350, eff. 3-1-85; r. (3), Register, January, 1989, No. 397, eff. 2-1-89; am. (2), Register, March, 1992, No. 435, eff. 4-1-92; cr. (3), Register, November, 1995, No. 479, eff. 12-1-95.
SPS 323.12 SPS 323.12Masonry chimneys. Masonry chimneys shall conform to the requirements of s. SPS 321.30.
SPS 323.12 History History: Cr. Register, November, 1979, No. 287, eff. 6-1-80; r. and recr. Register, February, 1985, No. 350, eff. 3-1-85; am. (8), Register, March, 1992, No. 435, eff. 4-1-92; r. and recr., November, 1995, No. 479, eff. 12-1-95; correction made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672.
SPS 323.13 SPS 323.13Factory-built chimneys or vents. Factory-built chimneys or vents shall be of an approved type.
SPS 323.13 Note Note: The department recognizes as approved, factory-built chimneys or vents designated as “residential type and building heating appliance," “building heating appliance," “B," “BW," and “L" types listed by Underwriters' Laboratories, Inc.
SPS 323.13(1) (1)Residential type and building heating appliance. An approved “residential type and building heating appliance" chimney may be used with liquid or gas-fired heating appliances where the flue gas temperature does not exceed 1000° F continuously, and does not exceed 1400° F for infrequent brief periods of forced firing.
SPS 323.13(2) (2)Type “B". An approved type “B" gas vent may be used with a vented, recessed wall heater.
SPS 323.13(3) (3)Type “BW". An approved type “BW" gas vent may be used with a vented, recessed wall heater.
SPS 323.13 History History: Cr. Register, November, 1979, No. 287, eff. 6-1-80; am. (1), Register, March, 1992, No. 435, eff. 4-1-92.
SPS 323.14 SPS 323.14Gas vents.
SPS 323.14(1) (1)General.
SPS 323.14(1)(a)(a) All gas-fired equipment shall be provided with vent pipes conforming with s. SPS 323.15 (2) (e), unless the manufacturer specifies other materials.
SPS 323.14(1)(b) (b) Plastic pipes and fittings used in venting flue gas shall bear the manufacturer's identification data.
SPS 323.14(2) (2)Dryer venting.
SPS 323.14(2)(a)1.1. All venting for clothes dryers, including for electric dryers, shall be rigid and smooth-walled. The connection to the dryer shall be made in accordance with the manufacturer's recommendations.
SPS 323.14(2)(a)2. 2. Gas-fired clothes dryers shall be provided with metal venting.
SPS 323.14 Note Note: Section SPS 322.39 (6) requires all dryer venting to terminate outside the structure.
SPS 323.14(2)(b) (b) Where dryer vent piping is concealed, a rigid metal vent pipe conforming with s. SPS 323.15 (2) (e) shall be used.
SPS 323.14(3) (3)Venting system location.
SPS 323.14(3)(a)(a) A venting system shall terminate at least 3 feet above any forced air inlet located within 10 feet horizontally. This provision does not apply to the combustion air intake of a direct-vent appliance.
SPS 323.14(3)(b) (b) The venting system of other than a direct-vent appliance shall terminate at least 4 feet below, 4 feet horizontally from, or one foot above any door, window, or gravity air inlet into any building. The bottom of the vent shall be located at least 12 inches above grade.
SPS 323.14(3)(c) (c) The vent terminal of a direct-vent appliance with an input of 10,000 Btu per hour or less shall be located at least 6 inches from any air opening into a building.
SPS 323.14(3)(d) (d) The vent terminal of a direct-vent appliance with an input over 10,000 Btu per hour but not over 50,000 Btu per hour shall be located at least 9 inches from any air opening into a building.
SPS 323.14(3)(e) (e) The vent terminal of a direct-vent appliance with an input over 50,000 Btu per hour shall be located at least 12 inches from any air opening into a building.
SPS 323.14(3)(f) (f) The bottom of the vent terminal and the air intake of a direct-vent appliance shall be located at least 12 inches above grade.
SPS 323.14(3)(g) (g) The exit terminal of a mechanical draft system shall be not less than 7 feet above grade where located within 3 feet of a public walkway that is intended for use by the general public.
SPS 323.14 History History: Cr. Register, November, 1979, No. 287, eff. 6-1-80; correction made under s. 13.93 (2m) (b) 7., Stats., Register, March, 1992, No. 435 ; r. and recr., Register, November, 1995, No. 479, eff. 12-1-95; cr. (3), Register, March, 2001, No. 543, eff. 4-1-01; CR 02-077: am. (2) (a) Register May 2003 No. 569, eff. 8-1-03; correction in (1), (2) (b) made under s. 13.92 (4) (b) 7., Stats., Register December 2011 No. 672; CR 15-041: renum. (1) to (1) (a), cr. (1) (b), renum. (2) (a) to (2) (a) 2. and am., cr. (2) (a) 1. Register December 2015 No. 720, eff. 1-1-16.
SPS 323.15 SPS 323.15Chimney connectors, smoke pipes and stovepipes.
SPS 323.15(1)(1)Definition. Chimney connectors, smoke pipes or stovepipes are passages for conducting the products of combustion from a fuel-fired appliance to the chimney.
SPS 323.15(2) (2)Construction and installation. The construction and installation of chimney connectors of solid-fuel-burning appliances shall comply with s. SPS 323.045 (4). The chimney connectors of all other fuel-fired appliances shall conform with the following requirements:
SPS 323.15(2)(a) (a) Concealed space. No chimney connector shall pass through any outside window, door or combustible outside wall, nor be concealed in any closet, attic or similar space.
SPS 323.15(2)(b) (b) Combustible partitions. Connectors for appliances shall not pass through walls or partitions constructed of combustible material unless they are guarded at the point of passage by:
SPS 323.15(2)(b)1. 1. Metal ventilated thimbles not less than 12 inches larger in diameter than the connector;
SPS 323.15(2)(b)2. 2. Metal or burned fireclay thimbles built in brickwork or other approved fireproofing materials extending not less than 8 inches beyond all sides of the thimble.
Loading...
Loading...
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.