iPower 6 inch Backdraft Shutter Damper Back Draft Blocker One-Way Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding

iPower 6 in. Backdraft Shutter Damper, Airflow Ducting Insert Backflow Preventer with 2 Inline Springs Loaded Folding Blades

Backdraft Damper A one-way airflow duct tool designed to prevent exhausted air and odors from sweeping back into ventilation systems Wide Applications Back draught valves can be inserted into ventilation ducts which are flexible or non-flexible. Designed for use with range hoods, bathroom fans, kitchen and other home HVAC applications. Essential for HVAC ventilation