Backdraft Damper Ducting Insert, 4-Inch, Black Galvanized Steel - AC Infinity
Deflecto Supurr Guard Louvered Dryer Vent Hood with Pipe and Collar, White and | eBay
4" METAL DRYER VENT/W DAMPER AND 1" STUCCO STOP | Surplus City Liquidators
Wall Vent - White - 6 Inch with Damper | Luxury Metals
Dundas Jafine ProShield 4 In. White Plastic Dryer Vent Hood - Pageland, South Carolina - Cedar Lane Supply, Inc
Amazon.com: Dryer Vent - Galvanized Steel - Heavy Duty Hooded Metal Caps for Exterior Side Wall Exhaust - Spring Loaded Backdraft Damper - Standard 4 Inch Diameter Duct by Vent Works : Appliances