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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

  • Product 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.

How it compares

Measured against everything we stock in General Hardware & Accessories, at today’s prices. Recalculated every night.

Price $84.99
Pricier than about 83% of the 2,607 comparable items (median $18.99).

Specifications

Product
Brand nameDAYTON
Product 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.

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