... tubeformer is used to produce the round rigid air duct for ventilation purpose, diameter from 80-1500mm. The spiral ... tubeformer is used to produce the round rigid air duct for ventilation purpose, diameter from 80-1500mm.Main technical ... pneumatic hydraulic station: 8kgf/cm2Key words: spiral tubeformer, spiral duct forming machine, ventilationd duct machine, spiral tube former, spiral ...