Gravity Ventilators

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

0 to 109,800 cfm
Up to 0.35 in. wg.

The GRSI 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.

180 to 15,200 cfm
Up to 0.4 in. wg.

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.

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.