General description Durable and versatile, the Round Ventilation Grille is made from high-quality 316 stainless steel, featuring a polished surface that ensures corrosion resistance and long-lasting durability. This adjustable air vent is designed for both air inlet and exhaust, making it suitable for various applications. Technical specifications Diameter: 125mm (5 inches) Drill holes: 4 holes (3.5mm) Usage Ideal for indoor exhaust and ventilation needs. Suitable for heating or ventilation in boats, mobile homes, or caravans. Can be used in garages for optimal ventilation. Allows for adjustable air volume to meet specific requirements.