Hon&Guan Duct Damper 6 inch, Backdraft Damper One-Way Airflow Vent Damper Backflow Preventer for 6 Inch Duct.

Hon&Guan 6 backdraft 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-2PCS.

The 6 inch duct damper has an opening of 150 mm and a length of 88 mm.

When installed horizontally, the springs should be positioned horizontally to allow for optimal opening and closing.

Back draught valves can be inserted into ventilation ducts which are flexible or non-flexible.

Designed for use with range hoods, bathroom fans, kitchen wood stove and other home HVAC applications.

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.