504.2 Exhaust penetrations. (071211 Item B2)
504.2 Exhaust Penetrations. Where a clothes dryer exhaust duct penetrates a wall or ceiling membrane, the annular space shall be sealed with noncombustible material, approved fire caulking, or a noncombustible dry exhaust duct wall receptacle. Ducts that exhaust clothes dryers shall not penetrate or be located within any fireblocking, draftstopping or any wall, floor/ceiling or other assembly required by the International Building Code to be fire-resistance rated, unless such duct is constructed of galvanized steel or aluminum of the thickness specified by Section 603.4 and the fire resistance rating is maintained in accordance with the International Building Code.. Fire dampers, combination fire/smoke dampers and any similar devices that will obstruct the exhaust flow, shall be prohibited in clothes dryer exhaust ducts.
The delayed effective daet of this Rule is January 1, 2011
The Statutory authority for Rule-making is G.S. 143-136; 143-138