... 140mm5. Strip speed: 1~38m/min, adjustable6. Suitable strip material: aluminum, stainless steel, galvanized steel, color coated steel, etc.7. ... pneumatic hydraulic station: 8kgf/cm2Key words: spiral tubeformer, spiral duct forming machine, ventilationd duct machine, spiral tube former, spiral duct former, ventilationd duct machine, HVAC duct machine, air duct machine. Spiral duct forming machine