Air King PWC6R Professional Hood Wall Cap, 6 Inch Round Go to amazon.com Related posts Top 11 recommendation 6 inch ducting Feature6-Inch diameterMade of Galvanized SteelBuilt in back draft damper1 Year parts only warranty DescriptionAir King PRC6R 22 gauge galvanized steel range hood wall cap with backdraft damper efficiently exhausts air from the home using 6" round ducting.