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 air proofing 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 standard. The qualities of machines have reached European standard.