Now available in a high-power, 4-speed, manual-opening model to quickly eject heat and odors. Patented rain shield on all models protects your RVs interior in any weather. Keypad ceiling controls on both remote control and manual-opening models. Raise the lid at the touch of a button on remote control models or with a simple twist of the locking knob on manual models. Includes mounting hardware. Powerful 12-volt fan moves up to 900 cu. ft. of air per minute. 23""L x 16.4""W x 5""D closed Mfr. 2 year warranty with lifetime limited warranty on lid. Roof sealant sold separately | Maxxair MaxxFan Deluxe RV Ventilator System, Manual 4-Speed Exhaust Only, White Lid