Angle Flange Adapter For Nominal Duct Diameter 4 in Inlet Diameter 4 in Material Steel Product Type Angle Flange Adapter Material Thickness 22 ga Overall Length 1 in Maximum Pressure Rating 42 in wc Weight 0.9 lb For Duct Height 4 in Flange Inner Diameter 4 in For Duct Width 4 in Flange Outer Diameter 6 in Inside Diameter 1/4 in Number of Holes on Flange 6 Overall Width 4 in Bolt Circle Diameter 5 1/4 in Minimum Pressure Rating 2 in wc Shape Straight Outlet Diameter 4 in