Michigan residential appliance installer license prep class instal the new for apple

Stud wall cavities and joist-space plenums shall be isolated from adjacent concealed spaces by tight-fitting fireblocking in accordance with Section R602.8.

Stud wall cavities shall not convey air from more than one floor level.These cavities or spaces shall not be part of a required fire-resistance-rated assembly.These cavities or spaces shall not be used as a plenum for supply air.Stud wall cavities and the spaces between solid floor joists to be used as air plenums shall comply with the following conditions:.Duct systems shall be constructed of materials having a flame spread index of not greater than 200.The use of gypsum products to construct return air ducts or plenums is permitted, provided that the air temperature does not exceed 125☏ (52☌) and exposed surfaces are not subject to condensation.Galvanized steel shall conform to ASTM A653. Field-fabricated and shop-fabricated metal and flexible duct constructions shall conform to the SMACNA HVAC Duct Construction Standards-Metal and Flexible except as allowed by Table M1601.1.1.Fibrous glass duct construction shall conform to the SMACNA Fibrous Glass Duct Construction Standards or NAIMA Fibrous Glass Duct Construction Standards.Factory-made ducts shall be listed and labeled in accordance with UL 181 and installed in accordance with the manufacturer's instructions.Equipment connected to duct systems shall be designed to limit discharge air temperature to not greater than 250☏ (121☌).

Michigan residential appliance installer license prep class instal the new for apple