Broan-Nutone 643FA Aluminum Fresh Air Inlet Wall Cap for 8" Round Duct Overall size showing on the surface is 12-1/2" wide x 13" high with a 6" hood and a 3-3/8" long attachment collar for 8" round ductwork (NOT for use with dryer venting); Width 0.000; Depth 0.000; Weight 0.00; Color Aluminum; Operating System; Batteries Included; Batteries Required; Number of Batteries; Battery Type; Language English; Assembly Required Designed for use with make-up air inlet applications (no backdraft damper) Wall cap is made of 22 gauge CRCQ steel construction with a .025 natural aluminum finish for durability and long life Sold as 1 to a carton Height 0.000