... tube former,spiral duct machinery,sprial duct forming machine, is for producing spiral ducts, tubes, pipes ... duct machinery,sprial duct forming machine, spiral duct machine, spiral tubeformer, spiral tube machine, is for producing spiral ... leakagespiral duct machinery, gorelocker, hdyraulic elbow making machine. No.ItemData1Duct diameter range85-1500mm2Duct lengthunlimited3Suitable raw materialAluminum ...