Angle Flange Adapter For Nominal Duct Diameter 11 in Inlet Diameter 11 in Material Steel Product Type Angle Flange Adapter Material Thickness 22 ga Overall Length 3 1/2 in Maximum Pressure Rating 42 in wc Weight 5.6 lb For Duct Height 11 in Flange Inner Diameter 11 1/8 in For Duct Width 11 in Flange Outer Diameter 13 5/8 in Maximum Airflow 4 620 cfm Inside Diameter 11 in Number of Holes on Flange 6 Overall Width 13 5/8 in Bolt Circle Diameter 12 3/4 in