Broan 350BK Roof Mount 120-Volt Powered Attic Ventilator, 1050 CFM, Black Dome 3.6 Amps 1050 CFM for up to 1500 square feet of attic space Precision balanced 14-Inch metal blade for maximum air flow and minimum sound level with PVC plastic dome provides ultraviolet protection and superior durability 23 gage metal flashing - allows for nailing and hot tar application and mesh bird screen Built-in adjustable thermostat - for automatic operation at your chosen temperature level and thermally protected and permanently lubricated motor Mounts easily between rafters - installation template included