Model BD-51

Backdraft Damper
Fabric Style Blade

The BD-51 backdraft damper employs gravity operated fabric style blades to restrict airflow and to permit the forward flow of air in the intended direction. The BD-51 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: 2" x 1/2" X 0.06" (51 x 13 x 1.5) extruded aluminum channel.

Blades: Double-coated neoprene Ventglas woven fiberglass-fabric.

Backing: 1/2" x 19 ga. (13 x 1.2) wire mesh.

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

Maximum Size:
Single Section: 36" x 24" (914 x 610)
Multiple Section: Unlimited

Ratings

Leakage:
21.0 cfm/ft² @ 4.0 in. wg. (0.11 m³/s/m² @ 1.00 kPa)
19.0 cfm/ft² @ 3.0 in. wg. (0.10 m³/s/m² @ 0.80 kPa)
11.0 cfm/ft² @ 1.0 in. wg. (0.0⁶ m3/s/m² @ 0.25 kPa)

Temperature: -65^oF to 400^oF (-54^oC to 204^oC)