Exhaust cooling fan - Car 12V RV Motorhome Roof fan Cooling fan Silent exhaust fan Energy saving for homes Trailer Travel caravan Walkbee. Made of high-quality ABS plastic, which is weatherproof and wear-resistant. Waterproof, dustproof and energy-efficient. Adjustable height to meet your different installation requirements. The top mounting type saves space. Mushroom-shaped roof exhaust fan, not only can bring fresh air into the car, but also prevents odors and gases from invading the living space of the motorhome Rated voltage: 12 V; Rated speed: 1800 revolutions per minute; Rated Airflow: 60 CFM; Mounting Thickness: Approx. 45mm-140mm (1.8"-5.5"); Overall Product Size: Approx. 145 x 103 mm/ 5.71 x 4.06 inches, Round Shape Opening Diameter: 118 mm (4.65")