Broan-Nutone 641FA Aluminum Fresh Air Inlet Wall Cap for 6" Round Duct Overall size showing on the surface is 9" square with a 5-1/2" hood and a 1-1/4" long attachment collar for 6" 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