Ten-year limited  warranty includes fiveyear Replacement Plus protection !Roof Mounted Power Attic Ventilator, Brown, 25" Diameter Metal Dome, 1500 High Capacity CFM, Ventilates Up To 2100 SQFT, With Adjustable Thermostat From 60 To 90 Degrees, 4.3 Amp Motor, 6 Bladed Fan Blade, 14-1/2" Diameter Opening, Needs 720 SQIN AIR VENT INC.Electric-powered attic vents use a thermostat to fight heat and a humidistat control ("All Season" model only) to help prevent moisture buildup inside the attic.Featuring a low-profile dome, the power attic vent is unobtrusive when installed on the roof face slanting away from the front of your home. It's an efficient option to replace wind turbines or roof pots already in place.