14x14" STANDARD SIZE: OUTPRIZE RV vent fan tight fits 14" RV's roof opening, also fits a MAX 14-1/2" opening not so tight. It will fit a 1.9-7" thick rv roof, but you may need to trim down the garnish when your RV roof is about 1.9-6.1" thick. REMOTE CONTROL: Compared with manual control, the remote control rv roof fan is not only more convenient and efficient when you can't easily reach your ceiling, but it can also be manually controlled in some emergency situations. Moreover, it is equipped with a rain sensor function which manual control is not available. 10-SPEED OPTIONAL: The reversible rv roof vent fan has a 10-speed adjustable with 400-1300 CFM in both air-in and air-out mode, you can simply operate it by the button or the remote control. QUIET AND ENERGY SAVING: The 12V RV fan operates with exceptional quietness and energy efficiency, producing a maximum noise level of only 45dB and consuming a mere 23 watts of power when running in the high-power mode. Enjoy the peaceful and undisturbed environment within your RV!