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 15¾ inch width, 15¾ inch height, 4½ inch length. This manual damper is ceiling/wall mountable.
Technical Specs
ItemManual Damper
For Nominal Duct Diameter16 in
Number of Panels1
Overall Height15 3/4 in
Rough Opening ShapeSquare
For Duct ShapeSquare
Overall Width15 3/4 in
Overall Length4 1/2 in
Rough Opening Length16 in
Rough Opening Width16 in
Damper TypeDynamic
Blade TypeFlat Blade
Closure TypeSpring
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 Diameter16 in
Fits Fan Diameter16 in
Free Area1.6 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 Flange15.75 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)