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Fiberglass Square Gravity Relief Ventilator


The MA Gravity Relief Ventilator is designed for providing relief for positive pressure, gravity exhaust of heat and smoke, or air intake supply. The MA is molded of tough, chemical resistant polyester resins and heavy-weave glass cloth.

Sizes (wheel diameters)

  • 6 to 60 inches (155 mm to 1,525 mm) square throat sizes


  • Airflow to 40,000 CFM (68,000 m3/hour)
  • Static pressure to 1 inch w.g. (250 Pa)