Dayton
Dayton 53DR20 20 in Backdraft Damper 22-1/2 in x 22-1/2 in
Galvanised steel backdraft damper fits 20 in fans and mounts vertically in a 22-1/2 in square wall opening
- Fits 20 in fans with 22-1/2 in x 22-1/2 in opening
- G-90 galvanized steel frame resists corrosion
- Mill finish aluminium blades handle 2500 FPM airflow
- 527 sq ft free area maximises ventilation
- Vertical wall mount with 9/64 in mounting holes
20-Inch Backdraft Damper for Wall Shutter
The Dayton 53DR20 is a gravity-operated backdraft damper designed for 20-inch fan installations. Its G-90 galvanized steel frame and mill-finish aluminum blades suit commercial or industrial ventilation systems requiring automatic airflow control. The unit mounts vertically in a wall opening measuring 22-1/2 inches square.
Sustained Airflow Performance at Rated Velocity
With a maximum velocity rating of 2500 feet per minute, the damper maintains consistent opening force under continuous high-volume airflow. The 2.527 square feet of free area minimizes pressure drop across the assembly during prolonged operation. Tie rods keep blades aligned so they do not flutter or bind when subjected to steady-state differential pressure.
Installation Constraints of the Wall-Mount Interface
The shutter requires a precise 22-1/2 by 22-1/2 inch rough opening and provides an overall 25 by 25 inch flange with 9/64 inch mounting holes. Frame depth is 2-1/4 inches and open depth extends to 6-1/4 inches, limiting use to walls that can accommodate this projection. Vertical mounting orientation is mandatory; horizontal or angled installations are not supported.
Highlights
- Fits 20 in fans with 22-1/2 in x 22-1/2 in opening
- G-90 galvanized steel frame resists corrosion
- Mill finish aluminium blades handle 2500 FPM airflow
- 527 sq ft free area maximises ventilation
- Vertical wall mount with 9/64 in mounting holes
Specifications
| Brand | DAYTON |
|---|
Questions about this item
How much noise and air resistance does the 2500 FPM maximum velocity create when the damper runs continuously?
At up to 2500 FPM the aluminum blades open fully, allowing 2.527 sq ft of free area so airflow passes with minimal turbulence and no motor noise from the damper itself.
What wall opening and mounting hardware are required before installing the 22-1/2 in by 22-1/2 in shutter?
You need a 22-1/2 in square rough opening, 9/64 in mounting holes for fasteners, and a vertical wall surface that can support the 25 in by 25 in galvanized steel frame.
Will the 20 in diameter fan flange and 1-1/2 in flange width mate with an older 20 in exhaust fan housing?
Yes, the damper is built for a 20 in fan diameter and its 1-1/2 in flange width matches standard housings of that size, so it bolts directly to existing units.
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