"Ventamatic solar powered attic ventilator mounts on the roof with a dome-mounted solar panel to power the 18V DC motor from sunup to sundown. Cools the attic to help reduce wear on roofing materials, remove moisture-filled air and lessen the cooling load of your air conditioning system. Battery Boost No, Ventilators Included qty. 1, Motor Voltage 18 DC, CFM 1,000, Auto and Manual Auto, Dimensions O.D. x H in. 25 x 25 x21, Solar Panels Included qty. 1, Blade Size in. 14, Works With Roof w/attic space, Extraction Rate 1,000, Solar Panel Wattage 12.6. Provides up to 1,000 CFM Sufficiently services a 1,500 sq. ft. attic Easy installation with no wiring Includes 12.6 Watt multi-crystal solar panel Requres 480 sq. in. minimum Net Free Air intake vent area for safe and proper operation 5-year vent/10-year solar panel limited warranty"