... , Air Duct Component 1- Rectangular Duct and Fittings 2 -TDC Duct Connection: Flange, Corner, G-clamp Duct Angle, Duct ... Mate , Air Duct Component TDC Duct Corner/ TDF Duct Corner TDC Corner : For Transverse Duct Connector system, ... Rectangular duct and fittings: Elbow, Transitions, Branches, Reducers etc. -----TDC duct connection: flange, Corner, G-clamp -----TDF duct connection: corner ...