The Maxxfan Deluxe is the only complete RV ventilation system that incorporates a vent, a fan, and rain protection all in a single unit! The 6401K is easy to operate, easy to clean, and with a 12-volt fan motor that moves over 900 cubic feet of air per minute, it quickly and efficiently circulates fresh air while allowing hot, stale air and odors to escape. With adjustable fan speeds, a built-in rain cover, and a smoke lid that closes securely for a streamline appearance, this is a great addition to any RV. Comes with a 12" diameter 10-blade fan and fits all standard 14x14" roof openings.