Exchanges the air in your recreational or commercial vehicle in minutes. Designed for maximum air flow efficiency. Cooking smoke and unpleasant aromas are whisked away in seconds. Polycarbonate dome with a lifetime guarantee opens manually. Powerful 12", 10 blade rotary fan works with open doors or windows to create a balanced air flow. Lightweight, compact, bug resistant, durable and seals tight when not in use. Motor operates at 3 speeds for selected performance levels. Installs in minutes and fits the existing opening provided by most recreational vehicle manufacturers. Fits 14" x 14" roof openings. 16-1/2"L x 16-1/2"W x 14-1/2" D. 2 year warranty. 1 per box.