6 " Foot Valve , Cast Iron Epoxy Coated Casing / Model # 302 (WATTS - 149B2702)

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.