RVK1A Roof Ducting Kit UL 181 CL 1

Maximize the air and sound performance of Broan ventilation fan by using one of wide variety of termination fittings specifically designed for Broan fans; Includes: Black steel roof cap with built-in back draft damper and bird screen, 4 IN diameter metal duct connector, Two nylon zip ties, 3 - 4 IN duct adapter, 8 FT of 4 IN diameter flexible foil ducting conforms to UL 181 Class 1 Air Connector requirements; Not recommended for dryer venting