Duct Reducer, For Nominal Duct Diameter 4 in, 16 in, Inlet Diameter 16 in, Overall Length 18 in, Product Type Reducer, Material Thickness 20 ga, Maximum Pressure Rating 42 in wc, Material Steel, Shape Straight, Outlet Diameter 4 in, Overall Height 18 in, Overall Width 16 in, Series QF, Minimum Pressure Rating 2 in wc