Ducting Pipe Non Return Valve 110MM Back Draft Damper Extractor Fan Shutter One Way Air Duct Baffle

Efficient ventilation tool: This air-regulating return air retarder is designed to improve ventilation by releasing polluted air from the automatically closing damper to prevent outdoor air from returning. PVC air volume adjustment vent: This 8-inch anti-wind air damper is made of durable materials that do not corrode or rust, and has lightweight aluminum damper blades designed to open outward by air pressure and close under gravity . Pressure-free setting: This leeward damper prevents wind backflow. The circular duct connector of this leeward damper can be easily installed vertically or horizontally. Wide range of uses: These dampers can be widely used in air conditioners, dryers, exhaust fans, range hoods, range hoods, heating pipes and vents. A variety of sizes to fit more sizes of exhaust ducts, Manufacturer: Jilijia