Backdraft Dampers - Steel Frame - GM-30 Series

The GM-30 series backdraft dampers allow horizontal airflow and prevent reverse airflow. Dampers in this series include the GM-30 (no flange), GM-31 with a flange on discharge and GM-32 with a flange on intake. Air pressure differential with assistance from adjustable counterbalance weights to minimize pressure loss opens these dampers. The dampers close by gravity.

Pressure: Up to 10 in. wg (2.5 kPa)

Velocity: Up to 2500 fpm (18 m/s)

Temperature: Up to 180°F (82°C)