General description Durable and sturdy, the Marine Butterfly Air Vent is made of 316 stainless steel, featuring a polished and adjustable rosette with a locking mechanism to meet your ventilation needs. This versatile vent is ideal for heating or ventilating boats, motorhomes, and caravans. Technical specifications Outer diameter: 125 mm / 5 inches Hole diameter: 3.5 mm / 0.14 inch Compatible with ventilation ducts up to 100 mm / 3.94 inches Material thickness: 1 mm Installation Easy to install, the stainless steel rosette comes with 5 mounting holes, ensuring a secure fit while also protecting against flies and other insects. Usage This vent is an excellent accessory for barbecue professionals, providing optimal ventilation for barbecues and garages. It is rust-proof, saltwater and acid resistant, making it suitable for various applications including barbecue barrels, fire barrels, smokers, boats, RVs, garden sheds, and garages. Other information