MaxxFan by Maxxair, a new one-of-a kind ventilator system that protects your RV interior - always - in any weather - rain or shine. Brings in fresh air and removes hot musty air and odors. A complete all in one system that fits standard 14" 14" RV roof openings. Remote control operates all fan functions from the palm of you hand. Includes a powerful 10-speed fan, thermostat, air intake and exhaust functions. Thermostat also displays room temperature. Easy to remove interior insect screen, simply rotate four retaining knobs to remove for cleaning, no tools required. Features a powerful, fuse protected, sealed ball bearing, 12-volt fan motor and a 12", 10 bladed, fan. All mounting screws and hardware included. If you're looking to save money and shipping on the required sealant, we do sell these fans with all the required sealant HERE!