This manual damper includes pre-punched conduit hole knock-out, felted edges for quiet operation, is made of galvanized steel, and it measures 41 inch width, 41 inch height, 4½ inch length. This manual damper is ceiling mountable.
Technical Specs
ItemManual Damper
Frame MaterialGalvanized Steel
Maximum Air Velocity2,250 fpm
Rough Opening Diameter39 1/2 in
Fits Fan Diameter36 in
Free Area8.9 sq ft
Frame Material Thickness20 ga
Frame Depth2 in
Maximum Pressure1 in wc
Blade MaterialAluminum
Single Acting/Double ActingSingle Acting
Maximum Ambient Temperature180 Degrees F
Flange Width1 in
Closure Velocity Rating2,250 fpm
Switch ActionNormally Closed
IncludesPre-Punched Conduit Hole Knock-Out, Felted Edges for Quiet Operation
Flange TypeRear Flange
Airflow DirectionVertical
Bushing MaterialNylon
Damper ApplicationBackdraft
Number of Panels1
Overall Height41 in
Rough Opening ShapeSquare
For Duct ShapeSquare
Overall Width41 in
Overall Length4 1/2 in
Rough Opening Length38 1/2 in
Rough Opening Width39.5 in
Damper TypeStatic
Blade TypeFlat Blade
Closure TypeGravity
Blade OrientationParallel Blades
Frame Less Flange39 sq in
CounterbalancedCounterbalanced
Mounting LocationCeiling
Blade Seal MaterialFelt
Mounting PositionHorizontal
Country of OriginUnited States
(subject to change)