1,Special design for Eroupe duct flange Standard , 2,L shape, U shape, All wraped duct section with formed connections DUCT LINE-7GDF Flange Automatically Duct Line7 is special design for Eroupe duct flange Standard(DW-144) , it is modular design with different flexible workstations.It produces duct from coil stock to ready-to-assembleare “L”,“U”,“Wrap”section with formed connections including ...