18-28-504.2 Exhaust penetrations.

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 603.3, Metallic Ducts and the fire-resistance rating is maintained in accordance with the Chicago Building Code.

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