Model BD-250

Backdraft Damper
Extruded Style Blade

The BD-250 backdraft damper employs gravity operated extruded style blades to restrict reverse airflow and to permit the forward flow of air in the intended direction. The BD-250 damper may be mounted vertically or horizontally (airflow up) in either exhaust or intake installations for low to medium velocity and pressure applications.

Standard Construction

Frame: 1-15/16" x 15/16" X 0.125" (49 x 24 x 3) extruded aluminum channel.

Blades: 0.07" (1.8) thick aluminum - extruded.

Linkage: Exposed on blade.

Bearings: Synthetic.

Seals: Extruded vinyl blade edge.

Minimum Size: 6" x 6" (152 x 152)

Maximum Size:
Single Section: 48" x 52" (1219 x 1321)
Multiple Section: Unlimited

Ratings

Leakage: 13.3 cfm/ft² @ 1.0 in. wg. (0.07 m³/s/m² @ 0.25 kPa)

Temperature: -40^oF to 200^oF (-40^oC to 93^oC)