... Fin Type Heat Exchanger Type of copper tube:inner screw thread/inner grooved pipe or bare/smooth pipe. Heat Exchanger:1.Finned Tube Heat Exchanger ... 2.Follow custom's design 3.Tube diameter:7MM,7.94MM,9.52MM,15 ... , Bus air-conditioner, Center air-conditioner for householdKey processTube bending, Punching the fins, Tube expanding, Degreasing, Welding ...