Broan Model RVK1A Roof Ducting Kit for 4" Duct. Contains the installation supplies you need to install your fan.
Features:
. Includes 8 ft. of 4", flexible, 2-ply metallic laminate ducting, 4" diameter metal duct connector, 2 "zip tie" clamps, and black steel roof cap with built-in back draft damper and bird screen. Also includes neoprene foam strip, which can be used to increase duct diameter if attaching to fan with 3" duct collar.
. Duct conforms to UL181 Class 1 air connector requirements
. Not recommended for dryer venting

