Hon&Guan Dryer Vent Cover Outside 4 Inch with 4 Inch Backdraft Damper

Upgrade design The 4 inch damper on both sides of the top and bottom of the two new concave inward pressure rib, and increase the thickness to 0.6mm,to ensure that the product is more solid, not easy to damage., Material The backdraft damper and the flap leaves is made of a galvanized steel, the axis are made of aluminum, while the spring are made of carbon steel., Wide applications Back draught valves can be inserted into ventilation ducts which are flexible or non-flexible. Designed for use with dryer vent backflow preventer, range hoods, bathroom fans, kitchen and other home HVAC applications., DURABLE CONSTRUCTION : The 4 inch vent cover outdoor with damper is made of sturdy 304 stainless steel, which is more heat-resistant and less prone to rust than ordinary iron and plastic air vents, and can ensure long-lasting performance and durability, EFFICIENT AIRFLOW : Magnetic block attached to the bottom of the damper, which makes it fit perfectly tightly with the air outlet when it is not working, preventing foreign objects from entering. When working, it can be easily open