Features: Provide clean air environment. Dust cover design, effectively prevent dust. Low noise, give you a quiet space. Adjustable height to suit your different installation requirements. Suitable for RV Camper caravan trailer boat marine caravan yacht printed top mount. Specifications: Color: white Voltage: 12V Speed: 1800 rpm Air volume: 60CFM Opening size:? 118mm (extension pipe can use a hose with an inner diameter of 120mm or a PVC pipe with a diameter of 110mm) Installation thickness: 80-160mm adjustable Connection: red wire (+); black wire (-) Package includes: 1 x 12V Volt RV roof ventilation fan Notice: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement and different measuring methods, please allow 1-5mm deviation. Always believe we can solve problems by communication if there are any problems. And if a return is the last solution, the product must be intact and the same as you receive, also should be within 30 days after you receive your package. Thank you and have a nice day.