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 dryer 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 Chicago Building Code to be fire-resistance rated unless such duct is constructed of galvanized steel or aluminum of the thickness specified in Section 18-28-603.3 and the fire-resistance rating is maintained in accordance with the Chicago Building Code. Fire dampers and similar devices that will obstruct the exhaust flow shall be prohibited in clothes dryer exhaust ducts.
(Amend Coun. J. 9-14-21, p. 35949, Art. V, § 11)