7 Inch Diameter Round Duct Spring Loaded Backdraft Damper Foam Weather Seal on Damper 1/4" Inch Steel Mesh Screen Made in The USA When venting through a wall is the best option, a quality wall vent should be considered. Vent Works 7 inch heavy gauge wall vents are not available at your local home improvement or general hardware store. This wall vent is constructed of 26 gauge galvanized steel. The back draft damper is spring loaded to prevent drafting from outside, we also included a ¼ inch steel mesh screen to prevent small animals from entering the vent. There are 2 other utility options available: screen only and damper only. Our vents are used in a wide variety of commercial and residential applications including heating systems, bathroom exhaust, kitchen exhaust, laundry room exhaust, venting spray booths, laser engraving machines, exhaust fan blowers, virtually anything with a 7 inch round exhaust. To Install: Cut a 7-1/8” inch hole in the outside wall and install, be sure to seal it. If you need a different material, finish, utility option, or size, we have other wall vents available on our product page.