spiral duct machine Spiral-seam round duct former is designed by design department of ACL Machinery Company. It can process a round duct with maximum diameter 1 .4m. Both of its intensity and airproofing are good. All diameter rounds change drastically. With constant high-speed cutting equipment, so the strip speed is fast, the capability is stable. Now all the round duct machines are manufactured in term of European standards. The qualities of machines have reached European standard. Specification For Straight Round Duct Former tube diameter mm 80-1400 Maximum tube length (depend on worktable) mm 3000thickness (mm) 0.5 to 1.0 strip width (mm) 137strip speed (m/min) 4-40dimensions (LxWxH)mm 2300x2350x2800weight (kg) 1750