... Application1Φ16/Φ9.52/Φ12.7Copper tube with aluminium finCold/hot water≤1.6Used for combined air handling unit, fan coil ... 18/Φ20Steel pipe winding with steel sheetSteam≤0.2Used for combined air handling unit, fan coil etc air conditioning devices3 ... products as per customized samples or drawing.14.producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, ...