1,Type:flat valve 2,Size:80mm,100mm,125mm,150mm,160mm,200mm,250mm 3, ... 4,Color:RAL9010.RAL9016 exhaust air valves are designed for installation on the ceiling or in a wall,- Made of zinc ... can be installed directly on a duct,- Quick and easy installation.- Size:80mm,100mm,125mm,150mm,200mm,250mm