1,Type:flat valve 2,Size:80mm,100mm,125mm,150mm,160mm,200mm,250mm 3,Material:galvanized steel 4,Color:RAL9010.RAL9016 exhaust air valves are designed for installation on the ceiling or in a wall,- 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 ...