Durable material: Air vent grille made of 316 stainless steel, polished surface, corrosion resistance, robust and durable to use. Size: The round air vent measures 125 mm (5 inches) in diameter, 4 drill holes (3.5 mm), easy to install; and the air volume is adjustable to meet your needs. Adjustable ventilation: Our incoming air can be used for indoor ventilation. Suitable for heating or ventilating a boat, motorhome or caravan, adjustable ventilation, change fresh air according to your needs. Application: The round ventilation grille can be used both indoors and outdoors for anyone who needs adjustable ventilation. Heat can be generated depending on the grilled food. Even garages can be optimally ventilated with these air vents. Product description Detail Ventilation grille Stainless Steel Air Vent Round Air vent grille made of stainless steel, polished surface, rustproof and corrosion resistant, more durable to use. Adjustable Inlet Air This inlet air is adjustable thanks to the adjustable lever, so that the air volume can be controlled to meet your needs by using the control valve on our vent. Exhaust grille 125mm This round air vent is ideal for occasions where there are many smokers, or for anyone who needs adjustable ventilation. such as boat, camping BBQ. Even garages can be optimally ventilated with these air vents. 125mm Mosquito Net Duct This round ventilation grille measures 125 mm (5'') in diameter, 3.5 mm installation holes, easy to install, for air flow or water on several occasions.***RUYI821**