... ,2.aluminum foil: hydrophilic or bare3.fin type: louver or flat fin or corrugated fin.4.copper pipe: diameter 7mm,7.94mm ... ,9mm,9.52mm, grooved or smooth tube5.side plate: ... customized samples or drawing.13.producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, bending, inspection, packingNote: ...