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Square galvanised steel frame with aluminum damper panel 14 by 14 inches

Dayton

Dayton 4HX64 Roof Mount Damper 14 in Square

SKU CH-6WM2-W4HRT

Aluminium back-draft damper with a 14 in square galvanised-steel frame for roof-mount exhaust

  • TypeRoof Mount, Exhaust
  • 14 in square frame fits 12 in fan for direct roof exhaust
  • .7 sq ft free area allows 2000 fpm maximum air velocity
  • Single aluminum panel opens automatically to prevent backdraft
  • 20 ga galvanized steel frame resists corrosion in outdoor mounting
  • 5 in overall depth suits low-profile roof installations

Roof Mount Backdraft Damper

This aluminium backdraft damper fits a 12 inch fan in a square roof opening. It is built for exhaust ventilation in commercial or industrial ductwork. The galvanised steel frame adds rigidity for permanent installation.

Installation notes

The unit mounts in a 12 1/2 inch square rough opening and has an overall height and width of 14 inches with a 4 1/2 inch depth. The 20 gauge frame slides into the curb; the single panel swings freely on gravity hinges. Installers sometimes forget to orient the hinge side downward, which prevents the blade from closing properly.

Free area and velocity limit

The damper provides 0.7 square feet of free area and is rated for a maximum air velocity of 2000 feet per minute. Selecting a fan that exceeds this velocity will cause flutter and noise. Systems requiring higher flow rates need a larger damper or multiple units.

Highlights

  • 14 in square frame fits 12 in fan for direct roof exhaust
  • .7 sq ft free area allows 2000 fpm maximum air velocity
  • Single aluminum panel opens automatically to prevent backdraft
  • 20 ga galvanized steel frame resists corrosion in outdoor mounting
  • 5 in overall depth suits low-profile roof installations

Specifications

BrandDAYTON
TypeRoof Mount, Exhaust

Questions about this item

How can I confirm the 14 in square backdraft damper is operating correctly after installation?

With the fan running, hold a lightweight tissue near the 14 in square face; the 2000 fpm maximum air velocity should push the single panel fully open and the tissue should be drawn steadily toward the 12 1/2 in rough opening without fluttering.

What components come with the 4HX64 roof mount damper and what must I supply separately?

The unit includes the aluminum backdraft panel mounted in a 20 ga galvanized steel frame measuring 14 in by 14 in by 4.5 in deep; you must provide mounting fasteners, duct sealant and a 12 in diameter fan rated for the 0.7 sq ft free area.

Which version of the Dayton 4HX64 should I choose for a 12 in square duct system?

Select the 14 in square model with 11 1/2 in rough opening length and 12 1/2 in rough opening diameter; these dimensions match a 12 in fan and square duct while delivering the listed 0.7 sq ft free area.

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