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_x000D_ Material: ABS_x000D_ Color: White_x000D_ Rated Voltage: 12V_x000D_ Opening Diameter: Approx. 118mm/4.65in_x000D_ Speed: 5000 rpm/min_x000D_ Air Volume: 200CFM_x000D_ Installation Thickness: Approx. 80-160mm/3.15-6.29in (adjustable)_x000D_ Installation Method: Open hole, connect at both ends._x000D_ Usage: Install and fix, and then it will start working_x000D_ Wiring Method: _x000D_ Fan positive connection switch intermediate stand_x000D_ The negative pole of the fan is connected to the negative pole of the power supply_x000D_ The positive pole of the power supply is connected to the tripod at both ends of the switch