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Unassembled centrifugal downblast roof exhaust fan 11 in wheel square base 19 in

Dayton

Dayton 16D539 11 in Downblast Drain Trap

SKU CH-228J-JQ07J MPN 16D539

11 in downblast drain trap delivers 793 to 1,526 cfm airflow at 1,635 to 1,800 RPM

  • TypeDrain Components
  • 11 in wheel diameter for targeted airflow
  • Belt drive assembly allows flexible motor matching
  • 793 to 1,526 cfm range covers variable demand
  • 1/4 to 1/3 hp motor compatibility fits standard supplies
  • 19 in square base suits common roof openings

11 in Downblast Drain Trap

The Dayton 16D539 is a centrifugal downblast roof exhaust fan designed for commercial ventilation. It moves between 793 and 1,526 cfm using a belt-driven assembly rated for 1/4 to 1/3 hp motors running at 1,635 to 1,800 rpm.

Suited for roof-mounted exhaust needing high

Installers handling high-static pressure applications up to 1 1/4 in wc will find the performance range appropriate. Buyers who need a fully assembled unit or a direct-drive configuration should look at something else.

11 in wheel diameter sets airflow and pressure

The 11 in wheel diameter directly determines the 793 to 1,526 cfm airflow range and the 1 1/4 in wc maximum static pressure. Verify that this wheel size matches the duct design before purchasing.

Highlights

  • 11 in wheel diameter for targeted airflow
  • Belt drive assembly allows flexible motor matching
  • 793 to 1,526 cfm range covers variable demand
  • 1/4 to 1/3 hp motor compatibility fits standard supplies
  • 19 in square base suits common roof openings

Specifications

TypeDrain Components
BrandDayton
Model16D539

Questions about this item

How is the 11 in wheel secured to the shaft during assembly of the unassembled unit?

Slide the wheel onto the motor shaft, align the keyway with the shaft key, then tighten the set screws against the flat or key to prevent slippage under belt tension.

Which parts of the belt-drive system will need periodic replacement?

The V-belt stretches over time and should be inspected for cracks or glazing; pulleys and shaft bearings also wear and may require replacement after extended service.

What airflow limit appears first when the fan runs continuously at 1,526 cfm?

The 1 1/4 in wc maximum static pressure is reached before the 1/3 hp motor limit, so duct resistance becomes the governing constraint at peak flow.

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