Adjustable height to suit your different installation requirements. Space saving top mounted type.Mushroom shaped roof exhaust fan not only brings fresh air into the vehicle, but also prevents odours and gases from entering the caravan living spaceRated voltage: 12V; rated speed: 1800 rpm; rated air flow: 60CFM; mounting thickness: approx. 45mm-140mm (1.8" - 5.5"); overall dimensions: approx. 145 x 103mm / 5.71 x 4.06", round opening diameter: 118mm (4.65")When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it! Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia