Fantech RSK 12 - 12" Duct Backdraft Damper
Use the Fantech RSK12 Backdraft Damper in your ventilation system to allow airflow in one direction and block airflow in the other direction.
The Fantech RSK12 Backdraft Damper features a galvanized steel collar and lightweight aluminum damper blades for long-term use. You can mount the damper vertically or horizontally as the 2 blades are spring loaded. Use this damper with circular ducts.