Section 322.42. Duct systems.

Latest version.

(1) Supply and return heating ducts, or portions thereof, that are not located completely within the thermal envelope, shall be provided with insulation with a thermal resistance of at least R-8.

(1m) Cooling supply ducts that pass through unconditioned spaces conducive to condensation, such as attics, shall be provided with insulation having a thermal resistance of at least R–8. The exterior of that insulation shall be covered with a vapor retarder that meets the requirements in s. SPS 322.38 (1)

(2) Building framing cavities may not be used as supply ducts.

CR 08-043 : cr. Register March 2009 No. 639 , eff. 4-1-09; CR 15-041 : cr. (1m) Register December 2015 No. 720 , eff. 1-1-16.

                    
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