The Sun God Solar Powered Heater is a quiet solar powered recirculating fan that distributes heated air into a room. This easy to install heater will fit into any single pane window and is just perfect for a space that is under 150 sq. ft. Under good winter sun conditions, up to 20 degrees F (11 degrees C) may be added to the ambient temperature in the room with a maximum air flow from the solar fan of 75 CFM. A 12 Volt / 20 Watt photovoltaic panel provides plenty of solar energy to power the fan to keep you nice and toasty. The panel can either sit on the window sill or be attached to the window header with the included hardware. Its dimensions are 47"x19"x2".