Suitable for universals 4inch diameter vent, using a 3inch to 4inch foams adapters for easy installation Make of impacts resistant / Metal, which is enduring and can vent cover from cracking or deforming under direct sunlight Comes with most of the features you need to install a venting systems, whether it for a dryer or a bathroom / kitchen exhaust fan / ceiling fan / ventilation fan, to exhaust hot air from a bathroom / storage shed / basement Louvered vent cover easily for maximums exhaust flows to exhaust hot air from the clothes dryer vent and bathroom fan venting Our 4inch through wall flexible wall duct kits adds wall plates and foils tape, which makes installation and maintenance more, with good sealing, and steels pipe clamps is apply to firmly connecting the duct kits, which is stable and enduring, Manufacturer: HZBB