Angle Flange Adapter For Nominal Duct Diameter 15 in Inlet Diameter 15 in Material Stainless Steel Product Type Angle Flange Adapter Material Thickness 20 ga Overall Length 5 in Maximum Pressure Rating 42 in wc Weight 9.25 lb For Duct Height 15 in Flange Inner Diameter 15 1/8 in For Duct Width 15 in Flange Outer Diameter 18 1/8 in Maximum Airflow 8 590 cfm Inside Diameter 15 in Number of Holes on Flange 8 Overall Width 18 1/8 in Bolt Circle Diameter 17 in