Product details:

An intake and exhaust fan plus thermostat to control room temperature. For installation on roof thicknesses of 1 or greater. 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.