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150mm To 180mm Plastic Double Flap Draft Blocker Backdraft Damper For Inline Duct Fan Exhaust Outlet Ventilation Shutter - Air Conditioner Parts - AliExpress
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VENTS-US 4 in. Galvanized Back-Draft Damper with Rubber Seal KOM 100 U - The Home Depot
BKF - Exhaust hood with backdraft damper - round flange
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Backdraft Dampers - Continental Fan
Counter Down Back Draft Workstation - Optional In-House Ventilation