... purpose, diameter from 80-1500mm. The spiral duct forming machine ZHTF-1500I is used to produce the round rigid ... . Suitable strip material: aluminum, stainless steel, galvanized steel, color coated steel, etc.7. Dimension: 3500mm x 2800mm x ... station: 8kgf/cm2Key words: spiral tubeformer, spiral duct forming machine, ventilationd duct machine, spiral tube former, spiral duct former, ventilationd duct ...