copper coil heat exchanger widely used in refrigeration industry High quality,Reasonable price. copper coil heat exchangerSuitable for R134A, R22 ... aluminum foil: hydrophilic or bare3.fin type: louver or flat fin and corrugated fin.4.copper pipe: diameter 7mm ... samples or drawing.13.producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, bending, inspection ...