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Square galvanised steel frame with aluminium damper panel 11.75 in wide 4.5 in deep

Dayton

Dayton 2FTX4 Backdraft Damper 11.75 In Square 4.5 In Deep

SKU CH-RKMB-R81FY

Aluminium backdraft damper for 12 in square duct, horizontal or vertical mount, 2000 fpm max velocity

  • TypeNo Flange, Horizontal or Vertical Mount
  • Square backdraft damper fits 12 in duct
  • Galvanised steel frame resists corrosion
  • 9 sq ft free area allows high airflow
  • Mounts horizontally or vertically for flexible install
  • 2000 fpm max velocity handles strong drafts

Application and mounting

The Dayton 2FTX4 backdraft damper suits square ductwork with a nominal diameter of 12 in and fits a 12 in fan. It mounts horizontally or vertically without a flange, simplifying installation in new or retrofit ventilation systems. Builders handling 11.75 in square rough openings will find the frame dimensions match directly.

Airflow and pressure limits

The single aluminium panel provides 0.9 sq ft of free area and handles air velocities up to 2000 fpm. Maximum static pressure is rated at 1 in wc, so the damper remains reliable under sustained flow rather than only brief peaks. The 20 ga galvanised steel frame resists deformation at these limits.

Duct interface constraints

The 4.5 in overall depth and 2 in frame depth define the space needed inside the duct run. Rough opening length is 12 in square, so the damper cannot accommodate rectangular or smaller square profiles without modification. Installers must verify that the surrounding duct matches these exact dimensions.

Highlights

  • Square backdraft damper fits 12 in duct
  • Galvanised steel frame resists corrosion
  • 9 sq ft free area allows high airflow
  • Mounts horizontally or vertically for flexible install
  • 2000 fpm max velocity handles strong drafts

Specifications

BrandDAYTON
TypeNo Flange, Horizontal or Vertical Mount

Questions about this item

How much pressure drop should I expect when the 11.75 in square backdraft damper runs continuously at 2000 fpm?

The damper is rated for a maximum pressure of 1 in wc at 2000 fpm, so continuous operation at that velocity stays within its design limit.

What ductwork must already be in place for the 12 in rough opening to fit?

A 12 in square duct with a 12 in rough opening length and width is required; the damper frame depth is 2 in and overall length is 4.5 in.

Will the 20 ga galvanised steel frame hold up when paired with older aluminium duct sections?

The 20 ga galvanised steel frame is compatible with standard 12 in square duct connections, including older aluminium sections that match the rough opening dimensions.

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