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                    | Shipping Type | Order By | 
|---|---|
| 
						Standard Ground Small Parcel FREE - On orders over $25 View Transit Map  | 
					7:00 PM CST | 
| 
						Next Day Air (Calculated at checkout)  | 
					3:00 PM CST | 
| 
						Standard Ground Freight FREE - On orders over $25  | 
					1:00 PM CST | 
            
        
            Model GRS is an aluminum ventilator designed to be used as an intake or relief unit on natural gravity or negative pressure systems. The GRS has a curb cap and requires a roof curb for installation.
            Model GRSF is an aluminum ventilator designed to be used as an intake or relief unit on natural gravity or negative pressure systems. The GRS has a flashing flange for roof attachment.