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  11. Backdraft Damper, Vert/Horiz Mtg, 27 3/4Sq
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Dayton

Backdraft Damper, Vert/Horiz Mtg, 27 3/4Sq

product price: $93.79
/ea
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Key Features

  • Type No Flange, Horizontal or Vertical Mount
  • Damper Size (In.) 27-3/4 x 27-3/4
  • Overall Size (In.) 27-3/4 x 27-3/4
  • Construction Material G-90 Galvanized Steel Frame and Aluminum Blades
  • Outside Flange (In.) 27-3/4 x 27-3/4
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Product Information

Dimensions

Damper Size (In.) 27-3/4 x 27-3/4
Overall Size (In.) 27-3/4 x 27-3/4
Overall Width 27 3/4 in
Overall Length 4 1/2 in
Overall Height 27 3/4 in
Rough Opening Diameter 28 in
Frame Depth 2 in
Fits Fan Diameter 28 in
For Nominal Duct Diameter 28 in
Rough Opening Length 28 in
Rough Opening Width 28 in

Details

Item 27.8"H-W 4.5"L Alu Spring Bkdrft Dampr
Type No Flange, Horizontal or Vertical Mount
Construction Material G-90 Galvanized Steel Frame and Aluminum Blades
Outside Flange (In.) 27-3/4 x 27-3/4
Includes Pre-Punched Conduit Hole Knock-Out; Felted Edges for Quiet Operation
Max. Velocity (FPM) 2,000 fpm
For Duct Shape Square
Damper Application Backdraft
Maximum Air Velocity 2000 fpm
Free Area 4.9 sq ft
Minimum Ambient Temperature -40 Degrees F
Blade Seal Material Felt
Rough Opening Shape Square
Mounting Position Horizontal; Vertical
Damper Finish Mill Finish
Series 411
Counterbalanced No
Blade Material Aluminum
Single Acting/Double Acting Single Acting
Airflow Direction Horizontal; Vertical
Bushing Material Nylon
Damper Type Dynamic
Closure Type Spring
Frame Material Galvanized Steel
Frame Less Flange 27 3/4
Blade Type Flat Blade
Switch Action Normally Closed
Flange Type None
Maximum Ambient Temperature 180 Degrees F
Opening Type Motorized
Blade Orientation Parallel Blades
Blade Material Thickness 26 ga
Closure Velocity Rating 2,000 fpm
Frame Material Thickness 20 ga
Number of Panels 1
Maximum Pressure 1 in wc

Description

27.8 In.H-W 4.5 In.L Alu Spring Bkdrft Dampr, Damper Application Backdraft, For Nominal Duct Diameter 28 in, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 27 3/4 in, Rough Opening Diameter 28 in, Rough Opening Shape Square, Fits Fan Diameter 28 in, For Duct Shape Square, Free Area 4.9 sq ft, Overall Width 27 3/4 in, Frame Material Thickness 20 ga, Overall Length 4 1/2 in, Frame Depth 2 in, Rough Opening Length 28 in, Maximum Pressure 1 in wc

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