We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Square aluminum backdraft damper wall mount 22.75 inches wide 4.5 inches deep

Dayton

Dayton 5NKN5 Backdraft Damper Wall Mount 22.75 In Square

SKU CH-Y77Z-S717Y

Aluminium wall-mount backdraft damper with a 22.75 in square frame, 4.5 in depth and 2.5 sq ft free area rated for 2250 fpm maximum air velocity

  • TypeWall Mount, Supply
  • Aluminium frame resists corrosion for long service life
  • 5 sq ft free area allows high airflow capacity
  • Gravity-operated blades prevent backdraft without power
  • 2250 fpm maximum velocity suits demanding ventilation needs
  • 75 in square fits standard wall openings

Square Backdraft Damper for 20-Inch Fan

The Dayton 5NKN5 is an aluminum wall-mount backdraft damper sized for a 20-inch fan. It fits a 22.75-inch square rough opening and provides 2.5 square feet of free area. The unit is 4.5 inches long with a .1-inch thick frame. It operates at air velocities up to 2250 fpm.

Suits Gravity-Vent Installs, Not Motorised Shutters

This damper suits installers who need a simple gravity-operated backdraft closure for square ductwork. It is not for systems that require motorised actuation or positive-seal shutters. Buyers needing a round flange or a different free-area rating should look elsewhere.

22.75-Inch Square Frame Decides Fit

The critical spec is the 22.75-inch square overall frame, which must match the wall opening. The 20-inch fan diameter and 2.5 square-foot free area follow from that frame size. Verify the rough opening before ordering.

Highlights

  • Aluminium frame resists corrosion for long service life
  • 5 sq ft free area allows high airflow capacity
  • Gravity-operated blades prevent backdraft without power
  • 2250 fpm maximum velocity suits demanding ventilation needs
  • 75 in square fits standard wall openings

Specifications

BrandDAYTON
TypeWall Mount, Supply

Questions about this item

What maximum air velocity does the 22.75 in square backdraft damper handle?

The damper is rated for a maximum air velocity of 2250 fpm, suitable for supply applications.

What rough opening size is required to mount this 22.75 in square wall damper?

A square rough opening of 20 1/2 in is needed for proper installation.

How is the single-panel aluminum backdraft damper installed in the wall opening?

The unit fits into the 20 1/2 in square rough opening; ensure the frame depth of 1 5/8 in aligns with the wall thickness and that airflow direction matches the supply orientation.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.