DC Thermal SD12-4000/2 12 Volt Ducted Heater 2 Vent 8016 BTU's Heat and Defrost Adjustable Fan Speed Heater Dimensions: 9x 5 X 4 12 Volt, 40 Amps, 480 Watts Brushless 50,000 Hour Ball Bearing Fan 10,000 Hour DC Thermal RuCar Vacuum Sealed Elements.