ANPTGHT 6 Inch Draft Blocker Backdraft Damper Duct Draft Stopper OneWay Airflow Ducting Insert Backflow Preventer Inline Fan Vent Deflector for 6 Inch Duct Dryer Vent Hose1Pcs

FunctionThis airflow regulating backdraft shutter fits over the TD lip and is designed to improve ventilation by preventing air from recirculating when the fans are not in use Material6 Inch 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 InstallationThe backflow flap is installed by inserting it into the ventilation pipe until it stops The position of the spring should be horizontal for horizontal installations so that it can open and close optimally The Backdraft shutter is installed so that the damper blades open only in the outflowing air direction Wide ApplicationBack draught valves can be inserted into havc ducting which are flexible or nonflexible Designed for use with range hoods bathroom fans kitchen and other home HVAC applications Quiet WorkThe 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 Note Back draught valves can be inserted into ventilation ducts which are flexible or non flexible Cannot be used with plastic ducts as the sizes are different.