Integral fin tubes were developed to increase the heat transfer efficiency of fluids while lowering the physical dimension and price of the heat exchanger. In these tubes the fins are rolled out from the wall of the tubes and hence are integral with the tube. As the fins are formed from the bottom tube by rolling out materials from its wall, the wall thickness below the finned section is diminished compared to the wall thickness at plain ends. These fin tubes may be manufactured from most tubular supplies and the hardness of the fabric usually determines the finning code or fin profile. The harder materials resembling Nickel Alloys, Stainless Steel, Titanium are provided with higher density (i.e 26,28,30 or 36 FPI). This shallow profile reduces the work hardening of the material and helps eliminate the possibility of root fin cracking.

Whereas, with softer supplies like Carbon Steel, Copper, and Copper Alloys are supplied with deeper profile giving a decrease fin density (i.e sixteen or 19 FPI).These tubes can also be provided with intermediate plain landing as well as U Bent, the place the U Bend portion will be Finned or Un-Finned.