Sterling 4" Duct Stainless Steel Wall Cap SWV 100

Sterling 4" duct stainless steel wall cap SWV 100 designed for exterior applications, the SWV is easy to install and has large openings to reduce clogging. Standard with flapper damper, it prevents outside air from Back drafting into the house through the dryer, bathroom, or kitchen exhaust fan. The heavy-gauge Stainless Steel construction is corrosion-resistant for years of service. Removable from ductwork for easy cleaning for dryer vent use. With Backdraft flapper damper Large free area reduces clogging Stainless Steel Construction Android finish with corrosion Protection.