TDF Flange is very convenient, quick and low cost way of connecting two ducts to each other. It is an integral flange formed on two ends of duct. The flange height is 34mm (+/-0.5mm).TDF Flange Forming Machine can produce an integral flange on ducting. One side of the machine has rolls for TDF Flange and on the second side has rolls for TDF Cleat. This machine, in combination with TDF Folder and Corner pieces, can help in joining one duct to another, very cost effectively