Stainless steel ventilation grille:Stainless steel, polished surface and anti-corrosion circular ventilation grille make it more durable. Adjustable air intake:This air intake can be adjusted by an adjustable pull rod, and the air volume can be controlled by our air control valve to meet your requirements. 125mm exhaust grille:This circular ventilation grille is very suitable for smoking or air-conditioned occasions, or all occasions requiring adjustable ventilation. Like boats, camping barbecues. Even the garage can use these wind rose diagrams for optimal ventilation. Resistant materials: The ventilation grille made of stainless steel 316 has polished surface, corrosion resistance, durability and can be used. Size: the diameter of the wind wheel is 125mm (5 inches) and there are 4 holes (3.5mm), so it is easy to install; And the air volume can be adjusted to meet your needs.