duct machine:Line 5 combines a feeding metal frame, leveler grooving roll, hydraulic notch and punch square machine, hydraulic s duct machine:Auto-line V ... square notch equipment, hydraulic cutter, movable Pittsburgh lock machine, duplex trans-verse flange manufacture machine, TDF hydraulic folder and CNC system. Its ... duct of small cross section area of 200X200mm. ACL Duct machine