10 Speed intake and exhaust fan plus thermostat to control room temperature and built in rain cover. - Provides over 900 CFM to keep you cool and comfortable - Fan runs with lid closed to circulate air (Ceiling Fan Mode) - Easy to remove interior insect screen, no tools required - 12 volt fan motor and a 12 inch - 10 blade fan - Fits all standard 14 in x 14 in roof openings - All mounting screws and hardware included. - 2-YEAR Limited WARRANTY with LIFETIME Limited Warranty on the lid