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 Material: ABS Rated Voltage: 12V Hole Diameter: Approx. 118mm/4.6in Speed: 3000 rpm/min Air Volume: 80CFM Installation Thickness: Approx. 80-160mm/3.1-6.3in (adjustable) Installation Method: open hole, connect at both ends to install Usage: Install and fix and start working Wiring: Positive pole of the fan connected to the middle tripod of the switch. Negative pole of the fan 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. PackageList: 1 x Fan 1 x Air Outlet 5 x Screws 1 x Manual