Air Duct, Duct Flange, Duct Corner 1- Rectangular Duct and Fittings 2 -TDC Duct Connection: Flange, Corner, G-clamp Air Duct, Duct Flange, Duct Corner Duct Corner TDC Corner : For Transverse Duct Connector system, the flange is separately installed onto the ductwork. 1) Material: Galvanized Steel, Stainless Steel2) Size: 20 mm , 25mm , 30 mm , 35mm , 40 mm3) Thickness: 2.0mm , 2.5mm , 3.0mm , 3. ...