The Maxxfan 4401K 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 pulls fresh air in while allowing hot, stale air and other unwanted odors to escape. With adjustable fan speeds and a smoke lid that closes securely for a streamline appearance, this is a great addition to any RV. When closed, the unit can still be operated to circulate air inside your RV like a ceiling fan. The Maxxfan 4401K features the Maxxair exclusive molded mounting tabs which allow for tool-free installation of the optional Maxxair FanMate Rain Shield Vent Cover, which helps protect your interior when the lid is up.