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[[File:Folded Spiral-seam Tubing.jpg|thumb|right|Folded Spiral-seam Tubing]] | |||
'''Folded Spiral-seam Tubing''' 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, the strip speed is fast, the capability is stable. | |||