Features: 1.The frame and blade are made of ABS material, painted white, waterproof, dustproof, energy?saving, durable and reliable. 2.Strong wind but quiet operation, low noise, extremely quiet ventilation, can quickly remove moisture and odor. 3.Equipped with dust-proof and insect-proof filter, two-way ventilation, supporting large-displacement ventilation, and more efficient. 4.Built?in thermal protection copper motor, it can work continuously without maintenance. It is suitable for ships, yachts, RVs, trailers, RVs, etc. It can also be used for kitchen, bathroom, and bedroom. 5.Top-mounted, space-saving, easy to install, no complicated tools, no waste of your time. Specification: Item Type: Exhaust Fan Material: ABS Color: White Rated Voltage: 12V Opening Diameter: Approx. 118mm/4.65in Speed: 5000 rpm/min Air Volume: 200CFM Installation Thickness: Approx. 80-160mm/3.15-6.29in (adjustable) Installation Method: Open hole, connect at both ends. Usage: Install and fix, and then it will start working Wiring Method: Fan positive connection switch intermediate stand The negative pole of the fan is connected to the negative pole of the power supply The positive pole of the power supply is connected to the tripod at both ends of the switch