Roof Vent Cover; Turbo/Maxx ™; Exterior Mount; Dome Type Ventilation Cover; Vented On One Side; For 14 Inch x 14 Inch Vents; Polyethylene; With Fan 3 Speed Adjustable; Intake And Exhaust Function; With Thermostat; 680 To 900 CFM (Cubic Feet Per Minute); 4 Amp At 12 Volt