Section 323.09. Dampers, registers and grilles.

 

(1)   Volume and backdraft dampers.

(a) Volume duct dampers shall be provided to permit balancing of the system.

(b) Volume dampers shall be provided with access.

(c) Supply ducts may not terminate in a garage unless a backdraft damper is provided.

(2)   Air registers and grilles.

(a) Supply air registers. All supply air outlets shall be provided with registers or devices which will provide a uniform distribution of air.

(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.

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.

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. Microsoft Windows NT 6.1.7601 Service Pack 1