Max. pressure1 in. wc
No. of panels1
Switch actionNormally Closed
Max. ambient temp.180°F
Min. ambient temp.-40°F
Series611 Series
Free area8.2 sq. ft.
Closure velocity rating2250 FPM
Frame materialGalvanized Steel
ActionSingle Acting
Mounting positionHorizontal, Vertical
Mounting locationCeiling, Wall
Airflow directionHorizontal, Vertical
Max. velocity2000 FPM
Blade seal materialFelt
Blade material thickness26 ga.
ApplicationBackdraft
Bushing materialNylon
Overall height35 3/4"
Blade materialAluminum
Max. air velocity2250 FPM
For nominal duct dia.36"
Closure typeSpring
Damper finishMill Finish
Overall width35 3/4"
Damper typeDynamic
For duct shapeSquare
Opening typeMotorized
Rough opening shapeSquare
Single acting/double actingSingle Acting
Frame depth2"
Rough opening length36"
Rough opening width36"
Blade orientationParallel Blades
Rough opening dia.36"
Frame material thickness20 ga.
Blade typeFlat Blade
Fits fan dia.36"
IncludedPre-Punched Conduit Hole Knock-Out
CounterbalancedYes