... HVAC. This spiral tube former,spiral duct machinery,sprial duct forming machine, spiral duct machine, spiral tubeformer, spiral tube machine, is for producing spiral round ducts, tubes, pipes in ... operation5) Light and small, suitable for site work6) Perfect swage, without leakagespiral duct machinery, gorelocker, hdyraulic elbow making machine. No.ItemData1Duct ...