Backdraft Damper - Adjustable Counterbalanced - Triple-V Blade - BD-84

Standard Construction

Frame: 8" x 2" X 14 ga. (203 x 51 x 2.0) galvanized steel channel.

Blades: 6" x 16 ga. (152 x 1.5) galvanized steel - triple-V

Axles: 1/2" (13) diameter plated steel.

Linkage: Concealed in frame.

Bearings: Steel ball bearing, press fit into frame.

Counterbalances: On-blade axle, crankarm and weights - adjustable.

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

Maximum Size: 48" x 96" (1219 x 2438)

Ratings

Leakage:
70 cfm/ft² @ 4 in. wg. (0.36 m³/s/m² @ 1.00 kPa) with no seals.
40 cfm/ft² @ 1 in. wg. (0.21 m³/s/m² @ 0.25 kPa) with no seals.

Temperature:
-25^oF to 250^oF (-32^oC to 121^oC) with no seals.
-10^oF to 150^oF (-23^oC to 66^oC) with seals.