Spiral-seam round duct former is designed by design department of C.F Machinery Company.It can process a round duct with maximum diameter 1.4m.Both of its intensity and airproofing are good.Alldiameter rounds change drastically.Wih constant high-speed cuting equipment,so the stip speed is fast,the capability is stable.Nowalthe round duct machines are manufactured in term of European standards.The qualities of machines have reached European standard.