Description Durable material: Ventilation grille made of high-quality materials. &a grave; Made of 316 stainless steel, polished surface, wear-resistant, corrosion-resistant, robust and durable. Size: The round ventilation slot has a diameter of 125 mm (5 inches), 4 drill holes (3.5 mm) and is easy to install. Install; and the air volume is adjustable to your needs. Adjustable ventilation: Our supply air can be used at any time. Adapted to heating or ventilating a boat, motorhome, or caravan, adjustable ventilation, changing the fresh air according to your needs. Application: The round ventilation grille can be used both indoors and outdoors. Outdoor grill for anyone who needs adjustable ventilation, depending on the food being grilled. Garages can also be optimally ventilated with these ventilation rosettes.