WD-400 Series
The WD-400 backdraft damper series are non-motorized that mount vertically for intake air or horizontally to allow vertical airflow down and prevent reverse airflow. Models WD-400 and 410 have no flange, model WD-420 has a flange on discharge, and WD-430 has a flange on intake. The dampers open using air pressure differential and close with springs.
- Pressure: Up to 2 in. wg
- Velocity: Up to 2500 fpm
- Temperature: Up to 180°F
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WD-400 Series
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