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For complete roof ducting installation of exhaust fans with 3" or 4" duct connector. Kit includes: Black steel roof capwith built-in back draft damper and bird screen, 4" diameter metal duct connector, 2 nylon zip ties, 3" to 4" duct adapter, 8' of 4" diameter flexible foil ducting (conforms to UL181 Class 1 air connector requirements). Also includes neoprene foam strip which can be used to increase duct diameter if attaching to fan with 3" duct collar. Not recommended for dryer or range hood venting.