Spun Aluminum Gravity Ventilator, Size 18, Model GRS-18

For natural gravity or positive pressure systems, model GRS offers excellent performance and durability for intake or relief applications. Featuring an exceptional low silhouette design and rugged construction this model is both efficient and economical. Features: All aluminum exterior for corrosion-resistant construction, Integral birdscreen to prevent entry of birds and small objects, Built-in curb cap with prepunched mounting holes for easy attachment to roof curbs
Availability:  6 in Troy

For use with fan sizes 1410-2150. Roof curb required for new installations.

Products specifications
Attribute name Attribute value
Base/Panel Length X Width 30 x 30 in
Curb Cap Size 30 in
Base Height 1 3/4 in
Base Top To Shroud 1 3/4 in
Base Top to Shroud Top 9 3/4 in
Damper Width x Damper Height 18 x 18 in
Height 9 3/4 in
Weight 19 lbs
Overall Diameter 35 1/2 in
Intake Area 3.42 ft²
Throat Area 1.83 ft²
Mounting Location Roof
Mounting Roof curb
Housing Material Spun Aluminum
Warranty Length 1 Year