copper coil heat exchanger widely used in refrigeration industry High quality,Reasonable price. copper coil heat exchangerSuitable for R134A, R22, R404A, R407C refrigerant and so on ... as per customized samples or drawing.13.producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, bending, inspection, packingNote: for ...