Features: 1.Strong wind, low noise, effective and quiet ventilation, quickly remove moisture and odors. Dust?proof filter, two?way large?displacement ventilation. 2.Built?in copper motor with thermal protection, it can work continuously without maintenance. 3.Space?saving top mounting type, easy to install, no complicated tools required. 4.Frame and blade are made of ABS material, painted white finish, waterproof, dustproof and energy?saving. 5.It can be used in kitchen and bathroom, suitable for marine ships, yachts, RVs, trailers, motorhome, etc. Specification: Item Type: RV Fan_x000D_ Material: ABS_x000D_ Rated Voltage: 12V_x000D_ Hole Diameter: Approx. 118mm/4.6in_x000D_ Speed: 3000 rpm/min_x000D_ Air Volume: 80CFM_x000D_ Installation Thickness: Approx. 80-160mm/3.1-6.3in (adjustable)_x000D_ Installation Method: open hole, connect at both ends to install_x000D_ Usage: Install and fix and start working_x000D_ _x000D_ Wiring:_x000D_ Positive pole of the fan connected to the middle tripod of the switch._x000D_ Negative pole of the fan 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. PackageList: 1 x Fan 1 x Air Outlet 5 x Screws 1 x Manual