Type: round and flat Size:80mm,100mm,125mm,150mm,160mm,200mm,250mm Material: galvanized steel Color: white(Ral9010,Ral9016) Detailed product Description- Made of zinc-coated steel,- Painted white (RAL 9010),- Easy air flow adjustment by turning the central part,- The blocking nut makes it possible to adjust a minimum slot,- Special design ensures low noise level,- High quality finishing and ...