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Centrifugal downblast exhaust ventilator with motor and base

Dayton

Dayton 7AX53 Downblast Exhaust Vent 14-3/4 In

SKU CH-NBX6-9DDB9 MPN 7AX53

Centrifugal downblast exhaust ventilator with 14-3/4 inch wheel delivering 3163 CFM at zero static pressure and 2883 CFM at 0.500-In. SP

  • TypeDrain Components
  • Downblast design directs exhaust away from roof
  • 3163 CFM free-air capacity for strong ventilation
  • 2883 CFM at .500 in. static pressure maintains flow
  • 1 HP three-phase motor runs on 208-220/440 V 60 Hz
  • Operates up to 180 °F inlet temperature

Downblast Exhaust Ventilator

The Dayton 7AX53 is a standard-duty centrifugal downblast exhaust ventilator designed for roof mounting in commercial or industrial ventilation systems. It delivers 3163 CFM at zero static pressure and 2883 CFM at 0.500-in. static pressure. The unit operates at a maximum inlet temperature of 180 degrees Fahrenheit and produces a sound rating of 20.0 sones at 0.250-in. static pressure measured at five feet.

Airflow capacity and static pressure

At free-air conditions the ventilator moves 3163 CFM, providing substantial exhaust capacity for general ventilation needs. Performance decreases to 2883 CFM when working against 0.500-in. static pressure, indicating the practical limit for ducted installations with moderate resistance. The 20.0 sone rating at 0.250-in. static pressure reflects a noticeable operating sound level that suits mechanical rooms or rooftop locations away from occupied spaces.

Three-phase power and roof curb requirement

The motor runs on 208-220/440 volt three-phase power at 60 Hz with a 1 HP rating and includes a NEMA 1 junction box for electrical connections. Installation requires a roof curb with a 22 by 22 inch base, which is not included and must be sourced separately for new installations. The unassembled drive package allows final configuration on site but demands appropriate lifting equipment and trade expertise for safe assembly.

Highlights

  • Downblast design directs exhaust away from roof
  • 3163 CFM free-air capacity for strong ventilation
  • 2883 CFM at .500 in. static pressure maintains flow
  • 1 HP three-phase motor runs on 208-220/440 V 60 Hz
  • Operates up to 180 °F inlet temperature

Specifications

TypeDrain Components
BrandDayton
Model7AX53

Questions about this item

Will the 14-3/4 inch wheel diameter match my existing 22 inch roof curb?

The unit requires a 22 inch by 22 inch roof curb for new installations; the wheel diameter is 14-3/4 inches.

How can I confirm the ventilator is delivering the rated 3163 CFM at zero static pressure?

Measure airflow at the discharge with a calibrated hood or traverse; it should read approximately 3163 CFM when static pressure is near zero.

Does the shipment include the NEMA 1 junction box and the drive package, or must I order them separately?

The unit ships unassembled with the drive package and includes a NEMA 1 junction box; a roof curb must be purchased separately.

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