This 411 series manual damper includes pre-punched conduit hole knock-out, felted edges for quiet operation, is made of galvanized steel, and it measures 13¾ inch width, 13¾ inch height, 4½ inch length. This manual damper is ceiling/wall mountable.
Technical Specs
ItemManual Damper
For Nominal Duct Diameter14 in
Number of Panels1
Overall Height13 3/4 in
Rough Opening ShapeSquare
For Duct ShapeSquare
Overall Width13 3/4 in
Overall Length4 1/2 in
Rough Opening Length14 in
Rough Opening Width14 in
Damper TypeDynamic
Blade TypeFlat Blade
Closure TypeGravity
Closure Velocity Rating2,000 fpm
Switch ActionNormally Closed
IncludesPre-Punched Conduit Hole Knock-Out, Felted Edges for Quiet Operation
Flange TypeNone
Airflow DirectionHorizontal, Vertical
Series411
Bushing MaterialNylon
Damper FinishMill Finish
Damper ApplicationBackdraft
Frame MaterialGalvanized Steel
Maximum Air Velocity2,000 fpm
Rough Opening Diameter14 in
Fits Fan Diameter12 in
Free Area1 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
Blade OrientationParallel Blades
Frame Less Flange13.75 sq in
CounterbalancedNot Counterbalanced
Mounting LocationCeiling, Wall
Blade Seal MaterialFelt
Opening TypeMotorized
Mounting PositionHorizontal, Vertical
Blade Material Thickness26 ga
Minimum Ambient Temperature-40 Degrees F
Country of OriginUnited States
(subject to change)