Broan 356BR1600 CFM Roof Mount Powered Attic Ventilator, Brown PVC Dome 8.0 Amps 1600 CFM for up to 2285 square feet of attic space. Dome Height from Roof: 8 Inches 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