Foundation Vent with Damper and Screen, 16"x8.7" Crawlspace Vent with Screen Fits 16”x8” Rough Opening: The 16”x8.7” fountdation vent cover for crawl space fits for standard 16”x8” rough foundation vent opening.Pls measure the vent opening size before ordering. Good for Foundation/Crawl Space Vent: The house crawl space vent cover for fountdation is a great solution for foundation/crawl space ventilation. The fountdation vent with damper and screen ensures controlled airflow switches airflow as the weather dictates to minimize moisture or retain heat. Easy to open and close based on the season: The house foundation vent for ventilating crawl space is easy to push of a lever to open and close the damper based on the season, takes away the hassle of installing and removing crawl space vent cover. Open the crawl space vent to allow air circulate and minimize moisture in summer, and close the damper to help retain heat to reduce the possibility of freezing pipes in the crawl space in winter. No More Holes for Critters: Our foundation garage vent cover with damper and screen is made of heavy duty galvanized steel. The special design of the durable screen that suppresses ember, prevents the small animals from entering, also not easily chewed by animal. Great for Various Vent Openings: The crawl space soffit vent cover outdoor is good for regulate airflow as needed. Widely used for foundation vents, subfloor vents, crawl space vents, soffit vents and garage vents in house crawl space, garage, basement, attic, shed, chicken coop. Easy installation: Our fountdation crawl space air wall vent cover package comes with screws, just install with screws in the pre installed holes.