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Industrial upblast exhaust ventilator, unassembled, galvanised steel housing, roof-mounted base forty inches square

Dayton

Dayton 7AX28 Upblast Exhaust Vent 30-1/2 In

SKU CH-B00H-Z0DCE MPN 7AX28

Centrifugal upblast exhaust ventilator moves up to 9845 CFM with a 1-1/2 HP motor for roof-mounted ventilation

  • TypeDrain Components
  • High airflow capacity with 9845 CFM at zero static pressure
  • Maintains strong 8226 CFM at 0.500-In. static pressure for ducted runs
  • Quiet operation rated at 15.7 sones at 0.250-In. SP measured 5 ft away
  • Handles inlet temperatures up to 300°F for demanding exhaust applications
  • Dual-voltage 115/230 V motor simplifies electrical installation on 60 Hz single-phase power

What this ventilator does

The Dayton 7AX28 is a centrifugal upblast exhaust ventilator built for roof mounting on commercial or industrial buildings. It moves up to 9845 CFM at zero static pressure and 8226 CFM at 0.500-In. SP, handling inlet temperatures as high as 300 Deg. F. The unit ships unassembled with its drive package and a NEMA 1 junction box, and it requires a roof curb for new installations.

Thermals noise and power

At 0.250-In. SP the unit rates 15.7 sones measured at five feet, giving a clear indication of acoustic output in typical duct conditions. The motor runs on 115/230 V single-phase power at 60 Hz and delivers 1-1/2 HP, so electrical supply and circuit protection must match those ratings. Maximum inlet temperature of 300 Deg. F defines the thermal limit for the airstream.

Installation requirements and clearance

A 40-In. by 40-In. base means the roof curb must provide at least that footprint and proper flashing for weather sealing. The NEMA 1 junction box is included for wiring connections, but the installer must supply the curb, duct transitions and any disconnect required by local code. The ventilator is not suited for wall mounting or for applications exceeding the stated temperature or static-pressure range.

Highlights

  • High airflow capacity with 9845 CFM at zero static pressure
  • Maintains strong 8226 CFM at 0.500-In. static pressure for ducted runs
  • Quiet operation rated at 15.7 sones at 0.250-In. SP measured 5 ft away
  • Handles inlet temperatures up to 300°F for demanding exhaust applications
  • Dual-voltage 115/230 V motor simplifies electrical installation on 60 Hz single-phase power

Specifications

TypeDrain Components
BrandDayton
Model7AX28

Questions about this item

How do I install the 30-1/2 inch wheel upblast exhaust ventilator and what step is often missed?

The unit requires a roof curb for new installation and arrives unassembled with a drive package; the most commonly missed step is installing and flashing the roof curb before mounting the ventilator base.

What maintenance will the 1-1/2 HP motor and belt drive need over time?

The belt-driven drive package requires periodic belt tension checks, alignment verification, and eventual belt replacement; motor bearings should be lubricated per the manufacturer schedule.

At what point does the 300 °F maximum inlet temperature limit performance during sustained operation?

The 300 °F maximum inlet temperature is the first hard limit; sustained exhaust above this temperature risks motor and component damage regardless of the 8226 CFM at 0.500-In. SP rating.

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