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Square aluminum frame damper with galvanized tie rods, 42 by 42 inches overall, vertical wall mount

Dayton

Dayton 53DR18 36 in backdraft damper wall shutter 39-1/2 x 39-1/2 in

SKU CH-JG7Y-D83EN

Fits a 36 in fan with a 39-1/2 in square opening and an extruded aluminium frame rated to 2500 FPM

  • Fits 36 in fans for direct airflow compatibility
  • Extruded aluminium frame with G-90 galvanised rods resists corrosion
  • 995 sq ft free area maximises ventilation efficiency
  • Vertical wall mounting simplifies installation on standard openings
  • Rated to 2500 FPM for high-velocity exhaust systems

36 in backdraft damper for wall-mounted fans

This 36 in backdraft damper fits fans of that diameter and mounts vertically in a wall opening. The frame is built from extruded aluminum with G-90 galvanized tie rods for corrosion resistance. A free area of 8.995 sq ft allows substantial airflow while preventing reverse draft when the fan is off. It suits installers who need a gravity-operated shutter for exhaust or intake systems.

Sustained airflow performance up to 2500 FPM

The damper is rated for velocities up to 2500 FPM, so it remains stable under continuous high-speed operation. Gravity-actuated blades open under positive pressure and close tightly when flow stops, reducing heat loss or infiltration. The aluminum frame and galvanized tie rods resist warping during long-term exposure to temperature swings and moisture. No motor or actuator is required, eliminating a common failure point in constant-duty ventilation.

Verify rough opening and flange clearance before

The shutter requires a precise 39-1/2 in x 39-1/2 in rough opening in the wall. Overall dimensions are 42 in x 42 in with a 1 1/2 in flange that overlaps the opening on all sides. Frame depth is 2 1/2 in and the blades project 5 3/4 in when fully open, so interior clearance must accommodate that swing. Mounting holes are 9/64 in; confirm fastener compatibility with your wall material.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $215.99
Pricier than about 84% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameDAYTON

Questions about this item

How much airflow noise should I expect when the 36 in damper runs continuously at 2500 FPM?

The unit is rated for a maximum velocity of 2500 FPM; actual noise will depend on the fan and duct design rather than the damper itself.

What wall opening must I already have cut for the 39-1/2 in x 39-1/2 in shutter to fit?

The shutter requires a rough opening of 39-1/2 in by 39-1/2 in and mounts vertically on the wall with 9/64 in mounting holes.

Will the extruded aluminum frame and G-90 galvanized tie rods corrode if paired with older galvanized ductwork?

The G-90 galvanized tie rods and aluminum frame are compatible with existing galvanized duct systems and resist corrosion in typical HVAC environments.

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