Flange Adapter For Nominal Duct Diameter 12 in Inlet Diameter 12 3/4 in Material PVC Product Type Angle Flange Adapter Material Thickness 0.3 in Overall Length 16 in Maximum Pressure Rating 10 in wc Weight 2.5 lb Flange Inner Diameter 12 3/8 in Flange Outer Diameter 16 in Inside Diameter 12 3/4 in Number of Holes on Flange 16 Overall Width 16 in Bolt Circle Diameter 14 3/8 in Minimum Pressure Rating Not Applicable Shape Straight Outlet Diameter 16 in Overall Diameter 16 in