Model BD-20

Backdraft Damper
Butterfly Style Blade

BD-20 backdraft damper employs gravity operated butterfly style blades to restrict airflow and to permit the forward flow of air in the intended direction. The BD-20 damper may be mounted vertically or horizontally in either exhaust or intake installations for low velocity and pressure applications.

Standard Construction

Frame: 22 ga. (0.85) galvanized steel.

Blades: 24 ga. (0.51) aluminum - butterfly

Seals: Neoprene blade edge seals.

Minimum Size: 5" x 5" (127 x 127)

Maximum Size: 36" x 24" (914 x 610)

Ratings

Maximum System Velocity: 1000 fpm (5.1 m/s)

Maximum System Pressure: 1 in. wg. (0.25 kPa)

Temperature: -25^oF to 150^oF (-32^oC to 66^oC)