Feature 1Ceiling ventilation fan, with the function of air supply and exhaust, bringing freshed air for your vehicle. Unique fan cover, allows light to enter the vehicle. 2Designed with stainless steel mesh, prevent mosquitoes, insects, sand and gravel from entering the interior of the RV. Imported plastic cover, resistant to yellowing, long durability. 3Reliable and efficient motor, which is made of pure copper core, low noise operation, which will not disturb you. 4The fan has 10 blades, which is more stable and quieter, twoway exhaust, waterproof, and not easy to age. 5This ventilation fan is suitable for large vehicles such as motorhomes, RVs, buses, yachts, etc. Easy to install, convenient for using. 6It can eliminate smoke in the kitchen and remove unpleasant odors in the bathroom, give you a more comfortable living environment.Item Type: RV Vent Fan Material: ABS Motor Current: 0.5-2.5AHole Size: Approx. 340 x 340mm/13.4 x 13.4in (maximum: 380 x 380 mm)Dimension: Approx. 420 x 420 x 182 mm/16.5 x 16.5 x 7.2inInstallation Thickness: Approx. 38-95 mm/1.5-3.7inMotor Power: 5WPower: 5-30W adjustableRPM: 1000-1800/minuteFan Blades: 10Applicable to: Large vehicles such as motorhomes, RVs, buses, yachts, etc.Features: The shell is made of imported and anti-yellowing plastic; equipped with stainless steel meshInstallation Method: Open hole installationUsage: Install and fix and start workingWiring: Black wire connected to negative pole, red wire connected to positive pole .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Vent Fan1 x ManualNoteThe 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 aftersales service and no reason to return or replace.