1. Remote Control: RV roof vent fan comes with a remote control. It has an air inlet/outlet function to draw in air and expel odors. Use the remote control to turn the fan on/off anywhere in the RV, with buttons A for air in, B for air out, C for off. 2. Advantages: Requires 340 x 340mm hole opening, RV vent fan is suitable for vehicle roof mounting. Equipped with stainless steel fly screen to effectively prevent fly from entering the cabin. Equipped with DC12V motor 6 inch blades, support rod is adjustable from 0-45° with knob. 3. Quick Air Exchange: RV roof vent with reversible 12V fan expel dirty air and draw air into your motorhome or enclosed trailer. With fly screen to maintain a comfortable environment permanently. 4. Versatile Replacement: Ideal replacement for Ventline, for Jensen, and for Elixir vents, and it is compatible with roofs 1-1/4in to 2-1/4in thick, fitting standard 14 x 14in openings. 2 wire design, easy to install. 5. Wide Application: Suitable for large transportation vehicles such as RV trailers, buses and yachts, quickly exchanging indoor and outdoor air and providing air for your vehicle. Specification: Item Type: RV Roof Vent Material: Sun Resistant Polyethylene Installation Hole Size: Approx. 340x340mm / 13.4x13.4in Fan Dimensions: Approx. 420x420x135mm / 16.5x16.5x5.3in Remote Control Battery: 23A 12V battery (shipped without battery) Number of Batteries: 1 Characteristic: Equipped with DC12V motor, 6 inch blade, stainless steel fly screen, and support rod remote control. Support rod adjustable from 0-45° with knob Suitable for installation on RVs, trailers, motorhomes, buses, yachts, etc. to quickly exchange indoor and outdoor air, providing freshness air for your cabin packing list: 1 x Roof Vent 1 x Remote Controller 1 x Sealant 1 x Support Rod Knob