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Relief Gravity Ventilators

Gravity relief ventilators are non-powered and work on pressure differential between the inside and outside of the building.

OVERVIEW

FGR

Gravity ventilators designed for relief applications with natural gravity or negative pressure systems. Units feature a low-silhouette, fabra hood-style housing.

  • 0 to 96,800 cfm
  • Up to 0.3 in. wg.
Purchase Options:

GRSR/GRSF

The GRSR is a spun aluminum air relief roof ventilator for natural gravity or positive pressure systems. This model can mount either to a roof curb or with a flashing flange (GRSF) for quick and easy installations.

  • 230 to 18,400 cfm
  • Up to 0.4 in. wg.