[Upgraded] Hon&Guan 10 Inch Duct Backdraft Damper, One-Way Airflow Ducting Insert Backflow Preventer Duct Draft Blocker, HVAC Inline Fan Vent

From the Manufacturer

【Upgrade design】 The 10 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.In addition, compared to others on the market, we use 3 springs to ensure better closure. 【Material】The 10'' duct damper and the flap leaves is made of a Galvanized steel to withstand temperatures up to 140°F, the Axis are made of aluminum, while the spring are made of carbon steel 【Installation method】The 10 inch backdraft damper has an opening of 250mm and a length of 88mm. When installed horizontally, the springs should be positioned horizontally to allow for optimal opening and closing 【Wide applications】Back draught valves can be inserted into hvac ducting which are flexible or non-flexible. Designed for use with range hoods, bathroom fans, kitchen and other home HVAC applications 【Lightweight valve wings】The valve wings open under the pressure created by the airflow; when the air flows in the opposite direction, it is automatically closed under the action of the spring, so as to cut off the flow. Rubber ring ensure 100% closure and quiet closing.