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" x 14" roof openings. All mounting screws and hardware included.. 2-YEAR Limited WARRANTY with LIFETIME Limited Warranty on the lid