Feature 1Sturdy Structure: Engineered with high grade ABS material, our roof exhaust fan is anti aging, anti ultraviolet, and rust resistant. It can easily tackle various outdoor conditions. 2Easy to Install: Designed for rooftop installation, the exhaust fan comes with accompanying screws for mounting. Moreover, it is equipped with a net that effectively prevents fly from entering the cabin. 3Dual Speed Control: The vent fan features adjustable dual speed wind settings, enabling you to switch between them with the press of a button, meeting different ventilation needs. 4High Airflow Capacity: With a high airflow capacity of 200CFM, our exhaust fan can quickly exchange indoor and outdoor air, providing fresh air for your cabin. 5Universal Compatibility: The ventilation exhaust fan is versatile and suitable for various settings, including marine boat, yacht, RV, trailer, camper, motorhome and more,. Item Type: RV Exhaust Fan Material: ABS Size: Approx. 168x217mm / 6.61x8.54in Installation Hole Size: 165mm/ 6.5in (Extension pipe can be used with 165mm outer diameter hose or 165mm outer diameter PVC hose) Power: 4W Fan Speed: 5000rpm /min Exhaust Air Volume: 200CFM Wall Thickness: 10-86mm (Can be adjusted by cutting PVC pipe) Power Cable: Red wire connects to the positive terminal and the black wire connects to the negative terminal Installation Way: Screw Fixing, Waterproof Adhesive Fixing Application: RV, Camper, Motorhome, Yacht Bathroom Kitchen Warehouse Lounge Installation Steps: 1. Confirm the need to open the hole position, and do a good job of surface cleaning, open a 165mm circular hole on the panel 2. Open the cover on the surface of the fan, put the fan into the hole and fix it with screws, and connect the power cable 3. Cover the lid and tighten the screws, and apply waterproof adhesive around the opening to complete the installation Package List 1 x Exhaust Fan Kit( 2 Accessories) 5 x Screws Note Installation requires drilling and wiring, we recommend professional engineers to assist in installation to ensure the best shopping experience.