roof ventilators


Centrifugal Roof Ventilator,
Upblast, Belt Driven


The ATB is designed for roof mounted exhaust of relatively clean air for applications that require the exhausted air to be moved up and away from the building and where re-entry into the building supply air is possible. The ATB features a high efficiency, non-overloading backward inclined centrifugal impeller precisely matched to a deep spun venturi. The impeller, motor and drive assembly are completely isolated from the fan supports by rubber isolators to reduce transmission of noise and vibration. The top cap also provides complete protection for the motor and drive assembly, while allowing quick access to these components without the need for tools.

Sizes (impeller diameters)

  • 19.47 to 49.21 inches (495 mm to 1,250 mm)


  • Airflow to 29,100 CFM (49,400 m3/hour)
  • Static pressure to 3.25 inches w.g. (810 Pa)

Installation Manual

  • Centrifugal Powered Roof Ventilators – IM-121
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