SIZE: Outer diameter 125 mm / 5 inch - drill holes 3.5 mm / 0.14 inch ,The round fan grille is easy to assemble with its 5 drilling holes DURABLE AND ROBUSTController on the side - adjustable fan made of 316 stainless steel. The rosette is highly polished and can be adjusted with a locking mechanism according to the ventilation needs. Perfectly suited for heating or ventilating a boat, mobile home or caravan. EASY ASSEMBLY If you want to supply a room with fresh air as needed, you've made the right choice. The stainless steel escutcheon installs easily and can also prevent flies or other insects from becoming a nuisance. Perfect ventilation accessory For grill professionals, the fan is a highlight to provide air to every grill. Depending on the food to be grilled, heat may be generated. Even garages can be optimally ventilated with these ventilation roses. Wide Range of Applications Gill fans are rustproof, salt water and acid resistant and ideal for BBQ barrels, fire barrels, smokers, incense burners, boats, RVs. cars, garden sheds, garages and all places where continuous ventilation is required.