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 17¾ inch width, 17¾ inch height, 4½ inch length. This manual damper is ceiling/wall mountable.
Technical Specs
ItemManual Damper
For Nominal Duct Diameter18 in
Number of Panels1
Overall Height17 3/4 in
Rough Opening ShapeSquare
For Duct ShapeSquare
Overall Width17 3/4 in
Overall Length4 1/2 in
Rough Opening Length18 in
Rough Opening Width18 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 Diameter18 in
Fits Fan Diameter18 in
Free Area2.2 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 Flange17.75 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)