Feature: 1. The ceiling ventilation fan has the function of air supply and exhaust, bringing in freshed air. The ventilation fan cover allows light to enter the vehicle. 2. The fan has 10 blades, which is more stable and quieter, two‑way exhaust, waterproof, and not easy to age. 3. Equipped with stainless steel mesh to prevent mosquitoes, insects, sand and gravel from entering the interior of the RV. The cover is made of imported plastic, resistant to yellowing, sturdy to use. 4. The motor is made of pure copper core, reliable and efficient, low noise, which will not disturb you. 5. Wide range of applications, suitable for large vehicles such as motorhomes, RVs, buses, yachts, etc. 6. Eliminate smoke in the kitchen, remove unpleasant odors in the bathroom, and provide a more comfortable environment. Specification: Item Type: RV Vent Fan Material: ABS Hole Size: Approx. 280 x 280mm/11 x 11in Motor Current: 0.4A Size: Approx. 360 x 360 x 122mm/14.2 x 14.2 x 4.8in Motor Power: 5W Lamp Power: 8W Applicable to: Large vehicles such as motorhomes, campers, buses, yachts, etc. Installation Thickness Range: Approx. 38-95mm/1.5-3.7in Installation Method: Open hole installation Usage: Install and fix and start working Wiring: Red wire is connected to positive pole, black wire is connected to negative pole. Package List: 1 x Vent Fan 5 x Screw Hole Plugs Note: The opening direction of the ventilating fan must be opposite to the direction of the front of the vehicle. If you do not install it according to the method, the airflow may lift the cover of the ventilating fan when driving at high speed! It will cause product damage! It is not a product problem, refuse after‑sales service and no reason to return or replace.