WCGA Gable Mount Power Attic Ventilator, 1,050 CFM, Ventilates Up To 1,500 SQFT, With Adjustable Thermostat From 60 To 120 Degrees, 15" Diameter Housing, 14" Diameter Fan Blade, 2.8A Motor, 6 Bladed Fan Blade, Needs 504 SQIN Of Net Free Intake Air, For Fan Shutter Use TV #102-319, 5 Year Limited Parts Warranty, 2 Year Limited Labor Warranty.