Hon&Guan 8 Inch Backdraft Damper,Upgrade Thickness and Rubber Ring One-Way Airflow Long Duct Damper Backflow Preventer Draft Blocker for 8 Inch Duct Fan in Range Hoods and Grow Tent

【Upgraded Material】Hon&Guan 8'' backdraft damper make of galvanized steel with black powder coat finish and spring-loaded aluminum damper blades.The thickness of the product has been upgraded to 1mm and the total length has been increased to 128mm, which is thicker and higher than similar products on the market.
【Ingenious Design】Hon&Guan vent damper has both an internal foam ring and two external fixed rubber rings that help to make the help to increase air tightness. In addition, internal foam ring can ensures 100% closure and quiet closing.
【Lightweight Valve Wings】Hon&Guan hvac damper designed to improve ventilation by preventing air from re-circulating when the fans are not in use,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.
【Easy Installation】The position of the 8 inch duct damper spring should be horizontal for horizontal installations so that it can open and close optimally. And the length of the side tie bar is less than 3mm, so don't need to worry about damaging the duct during installation.
【Wide Applications】Back draught valves can be inserted into havc ducting which are flexible or non-flexible. Designed for use with range hoods, exhaust fans, vents and other home havc applications.

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