Round stainless steel ventilation panel: the ventilation plate is made of high-quality 316 stainless steel, which is strong and durable and is corrosion, rust and oxidation resistant, not easy to deform and smooth surface.Adjustable opening and closing design: the round ventilation rosette has a manual opening and closing handle design that allows you to control the opening and closing of the ventilation flap, so that the air flow or air can be controlled depending on the situation very comfortable.Easy to install: outer diameter 125 mm - hole holes 3.5 mm. The ventilation valves are easy to install with their 4 drill holes. Open the bayonet and press the stainless steel ventilation plate in so that it sits firmly.Wide application: this type of circular ventilation grille can be closed. Due to its rust protection, salt and acid protection functions, it is very suitable for barbecue boxes, coal basins, smokers, incense burners, boats, caravans, garden sheds, garages and anywhere continuous ventilation is required.