"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, Motor Voltage 18 DC, Auto and Manual Auto, Dimensions O.D. x H in. 25 x 25 x21, Solar Panels Included qty. 1, Blade Size in. 14, Ventilators Included qty. 1, CFM 1,000, Extraction Rate 1,000, Solar Panel Wattage 12.6, Works With Roof w/attic space. 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"