Adjustable ceiling ventilation outer diameter 125 mm - drill holes 3.5 mm - for ventilation pipe 100 mm - material thickness 1.0 mm Made of high quality stainless steel, environmentally friendly, safe, robust and durable to use. Easy to InstallThe ventilation panels are easy to install with their 4 holes. Very easy to install and the air volume can be controlled to meet your demand by adjusting the control valve of our air vent, convenient. Adjustable Ventilation Can be used for indoor exhaustion, less noise, and can be perfect also used to decorate. Perfect for heating or ventilation on a boat, RV or caravan You want to provide a room with fresh air as needed, make the right choice. Easy to clean Simple design, fashionable Appearance, neat finish and excellent quality. Can be installed perfectly on the ceiling or wall, also very easy to disassemble for easy cleaning. Ideal accessoryFor grill and smoker professionals, sailors, campers and for anyone who needs adjustable ventilation. For the grill professionals, the fan is a highlight for the air supply to every grill. Depending on the food to be grilled, the heat can be generated. Even garages can be optimally ventilated with these ventilation rosettes.