Broan 35316 Gable Mount 120-Volt Powered Attic Ventilator, 1600 CFM 3.9 Amps 1600 CFM for up to 2280 square feet of attic space Quiet high-performance operation for inside-the-attic applications Galvanized steel housing ribbed for added strength with mounting brackets simplify installation 14-Inch diameter steel blade specially designed for maximum air movement Operates automatically - adjustable thermostat built-in with thermally protected permanently lubricated motor