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Gravity Relief / Intake Ventilator


The GRV Gravity Relief/Intake Ventilator is a low silhouette spun aluminum gravity ventilator designed to match the appearance of spun aluminum power roof ventilators. Provides natural gravity ventilation and may also be used as an intake if sized properly.

The GRV is available for quick delivery as part of Twin City Fan & Blower’s QuickShip program. The QuickShip program provides rapid delivery of standard products so that tight project deadlines can be met and downtime on replacement work can be held to a minimum.

Sizes (impeller diameters)

  • 9 to 48.3 inches (230 mm to 1,230 mm)


  • Airflow to 25,100 CFM (42,600 m3/hour)
  • Static pressure to 0.375 inches w.g. (90 Pa)