air duct fire damper for Air Conditioning  

Back Draft Damper is commonly used in air conditioning or ventilation duct system. It is a device to prevent headwind. When the fan stops, the air duct check valve will automatically close without external force. 【Material】The backdraft damper is made of stainless steel and the internal blade is made of galvanized sheet. 【Installation】The backdraft damper is installed by pushing it into the ventilation pipe as far as it will go. The position of the spring should be horizontal when the flap is installed horizontally so that it can be opened and closed optimally. This also applies to the vertical installation. 【Function】This airflow regulating backdraft shutter fits over the TD lip and is designed to improve ventilation by preventing air from re-circulating when the fans are not in use. 【Wide Application】 These backdraft dampers can be widely used in ACs, exhaust fans, extractors, range hoods, heating ducts, vents and other residential, commercial and industrial applicat…