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Square roof-mounted centrifugal downblast exhaust ventilator with motor and junction box

Dayton

Dayton 7AX66 Downblast Exhaust Vent 30-1/2 In

SKU CH-DCP5-VSKAX MPN 7AX66

Centrifugal downblast exhaust ventilator for roof mounting with a 30-1/2 inch wheel delivering 9719 CFM at zero static pressure

  • TypeDrain Components
  • High airflow capacity with 9719 CFM at zero static pressure
  • Maintains strong 7952 CFM at 0.500-In. SP for ducted runs
  • Quiet operation rated at 14.9 sones at 5 ft distance
  • Handles inlet temperatures up to 180°F for demanding environments
  • Dual-voltage 115/230 V motor simplifies electrical installation

Downblast Exhaust Ventilator

The Dayton 7AX66 is a centrifugal downblast exhaust ventilator built for standard-duty roof mounting. It serves commercial or industrial facilities that need to move large volumes of air through a 30-1/2 inch wheel diameter unit. The assembly arrives unassembled with a drive package and includes a NEMA 1 junction box for electrical connections. A roof curb is required for new installations.

Sustained airflow performance

At zero static pressure the unit delivers 9719 CFM, dropping to 7952 CFM when operating against 0.500-In. SP. The 1-1/2 HP single-phase motor runs on 115/230 volt, 60 Hz power to maintain these flow rates during continuous operation. This performance profile suits applications where steady exhaust capacity matters more than peak burst figures.

Acoustic and thermal profile

The ventilator produces 14.9 sones measured at 0.250-In. SP from five feet away, indicating moderate noise levels for rooftop equipment. Maximum inlet temperature is rated at 180 degrees Fahrenheit, allowing it to handle warm exhaust streams without thermal overload. The 40 by 40 inch base provides a stable footprint on the roof curb.

Highlights

  • High airflow capacity with 9719 CFM at zero static pressure
  • Maintains strong 7952 CFM at 0.500-In. SP for ducted runs
  • Quiet operation rated at 14.9 sones at 5 ft distance
  • Handles inlet temperatures up to 180°F for demanding environments
  • Dual-voltage 115/230 V motor simplifies electrical installation

Specifications

TypeDrain Components
BrandDayton
Model7AX66

Questions about this item

How loud is the 14.9 sone rating when the 30-1/2 inch wheel runs continuously?

At 14.9 sones measured at 0.250-In. SP and five feet, the unit produces a noticeable but moderate sound level typical for a 1-1/2 HP centrifugal ventilator operating all day.

What electrical supply and roof curb are needed before installing the 7AX66?

The motor requires a 115/230 V, 60 Hz, single-phase circuit and a NEMA 1 junction box is included; a roof curb must be purchased separately for new installations.

Will the 40 by 40 inch base fit the existing curb on my older roof penetration?

The ventilator’s base width and length are both 40 inches, so it matches any curb with the same outside dimensions; verify your current curb measures 40 x 40 before mounting.

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