Durable Material: Air Vent Made from 316 stainless steel material, polished surface, corrosion resistance, sturdy and durable to use. Size: the Round Air Vent is measures 125mm(5inch) in diameter, 4 drill holes(3.5mm), easy to install; and the air volume is adjustable to meet your need. Adjustable Ventilation: Our Incoming air can be used for indoor exhaust. suitable for heating or ventilating a boat, mobile home or caravan, Adjustable ventilation, fresh air change according to your needs. Application: The round ventilation grille can be used indoors as well as outdoors for anyone who needs adjustable ventilation. Heat can be generated depending on the food being grilled. Even garages can be optimally ventilated with these ventilation rosettes. Product description Detail Ventilation Grille Stainless steel ventilation grille Round Ventilation Grille made from stainless steel, polished surface, rust-proof and corrosion-resistant, more durable to use. Adjustable Air Intake This Incoming Air is adjustable through the adjustable lever, the air volume can be controlled to suit your demand using our vent control valve. 125mm Exhaust Grille This round ventilation grille is ideal for occasions where there are a lot of smokers, or for anyone who needs adjustable ventilation. such as boat, camping barbecue. Even garages can be optimally ventilated with these air vents. 125mm Mosquito Net Duct This round ventilation grille is 125mm (5'') in diameter, 3.5mm installtion hole, easy to install, for airflow or waterflow on multiple occasions.