Broan 6" Wall Cap
This wall cap is for use with 6" round duct. It has a built-in bird screen, and a spring-loaded backdraft damper. It is made of 24 guage steel, with a black electrically-bonded epoxy finish.
Dimensions: 9.0" square (including flange), 5.50" depth (from siding), with a 6" over length (including duct connector)