Backdraft Dampers - Steel Frame - WD-400

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 (0.5 kPa)

Velocity: Up to 2500 fpm (13 m/s)

Temperature: Up to 180°F (82°C)