Dayton
Dayton 53DR17 20 in backdraft damper 22-1/2 in x 22-1/2 in opening
20-inch backdraft damper with extruded aluminium frame and G-90 galvanised tie rods fits a 22-1/2 by 22-1/2 inch wall opening
- Prevents reverse airflow with gravity-operated aluminium blades
- Fits 20 in fans using a 22-1/2 in square wall opening
- Extruded aluminium frame and G-90 galvanised tie rods resist corrosion
- 519 sq ft free area allows high-volume air movement
- Rated for velocities up to 2500 FPM in vertical wall installations
20-inch Backdraft Damper for Wall Shutter
The Dayton 53DR17 is a gravity-operated backdraft damper designed to fit a 20-inch fan diameter within a 22-1/2 by 22-1/2 inch rough opening. It suits HVAC professionals and facility managers who need automatic airflow control through exterior walls without powered actuators. The unit mounts vertically and uses an extruded aluminum frame with G-90 galvanized tie rods for corrosion resistance in outdoor environments.
Sustained Airflow Performance at 2500 FPM
The damper blades open passively when fan pressure exceeds the counterweight threshold and close by gravity when the fan stops, preventing backdrafts and weather ingress. With a free area of 2.519 square feet, the shutter maintains rated performance up to a maximum velocity of 2500 FPM during continuous operation. The 5-3/4 inch open depth and 2-1/2 inch frame depth allow full blade travel without binding under sustained flow conditions.
Vertical Wall Mount with 9/64-inch Fastener Holes
Installation requires a vertical wall opening of 22-1/2 by 22-1/2 inches to accept the 25 by 25 inch overall shutter flange. The 1-1/2 inch flange width provides a sealing surface against the wall, while 9/64-inch mounting holes accept standard sheet-metal screws or rivets. Common issues include insufficient rough-opening clearance causing blade interference and failure to verify vertical orientation, which prevents proper gravity closure.
Highlights
- Prevents reverse airflow with gravity-operated aluminium blades
- Fits 20 in fans using a 22-1/2 in square wall opening
- Extruded aluminium frame and G-90 galvanised tie rods resist corrosion
- 519 sq ft free area allows high-volume air movement
- Rated for velocities up to 2500 FPM in vertical wall installations
Specifications
| Brand | DAYTON |
|---|
Questions about this item
How much airflow resistance does the 2.519 sq ft free area add when the damper runs continuously?
The 2.519 sq ft free area keeps pressure drop low even at the 2500 FPM maximum velocity, so the damper adds minimal resistance during all-day operation.
What wall opening must already exist for the 22-1/2 in x 22-1/2 in shutter to fit?
A rough opening of 22-1/2 in by 22-1/2 in is required; the 25 in x 25 in overall frame then covers the opening with a 1-1/2 in flange.
Will the 9/64 in mounting holes line up with the anchor pattern on my existing 20 in fan housing?
The 9/64 in holes are spaced for the 25 in frame, so alignment depends on your fan housing bolt pattern — check the housing drawing before mounting.
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