... 9mm,9.52mm,10mm,etc fin:louver,flat,corrugated fin did 3.0MPa nitrogen test fin evaporator coil Suitable for R134A, R22 ... ,2.aluminum foil: hydrophilic or bare3.fin type: louver or flat fin or corrugated fin.4.copper pipe: diameter 7mm,7. ... customized samples or drawing.13.producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, bending, inspection, ...