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 4 in. wg
- Velocity: Up to 2500 fpm
- Temperature: Up to 180°F
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GM-30 Series
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