Manufacturer: American Warming and Ventilating

BD-40 3-½” Commercial Rectangular Backdraft Damper.
Counterbalanced Backdraft, Single Thickness (Vertical or Horizontal Mount).

Damper Depth3-1/2"

DescriptionCounterbalanced Backdraft, Single Thickness (Vertical or Horizontal Mount)

Max Face Velocity3000 FPM

Max Pressure.5 in. wg

Max Temperature250 F

Min Size6" x 6"

Max Size48" x 72"

Frame Material16 Ga. Galvanized Steel

Blade Material16 Ga. Aluminum, 10-3/8" Max Width

Axles1/2" Dia. Plated Steel, Stub

BearingsPress Fit Flanged Ball Bearings

LinkagePlated Steel Brackets, Brass Barrels and Plated Steel Rod (BD-41 Only)

StopsGalvanized Steel


ActuatorCounterbalanced For Ease Of Operation

SealsNone Is Standard (upon request, see seal options)