Manufacturer: American Warming and Ventilating

BD-20HD 1-⅞” Commercial Rectangular Backdraft Damper.
Gravity Operated Heavy Duty Backdraft, Single Thickness (Vertical Mount).

Damper Depth1-7/8"

DescriptionGravity Operated Heavy Duty Backdraft, Single Thickness (Vertical Mount)

Max Face Velocity3000 FPM

Max Pressure1 in. wg

Max Temperature200 F

Min Size6" x 6"

Max Size24" x 96"

Frame Material.063 6063-T5 Extruded Aluminum (Flanged or Drop-In)

Blade Material22 Ga. Aluminum

Axles3/16" Dia. Plated Steel, Full Length

BearingsHeavy Duty Molded Nylon

LinkagePlated Steel Brackets, Stainless Steel Shoulder Rivets and Aluminum Linkage Bars

StopsAluminum Angle


ActuatorGravity Operated Is Standard (Optional Manual or Electric)

SealsPolyurethane Sponge On The Sill and Felt Between Adjacent Blades