Here we have case 1 as a normal Helical fin tube with no Turbulator and 6 passes and Case 2 our own wire wound fin tube (a much higher efficiency fin tube we make) and our flexible Turbulator inside the tube.The results are given as under.

1. The surface area of fins per  linear foot of  wire wound fin tube is 4.02 feet against 6.16 for the normal    helical fin.
2. The number of tube rows is reduced from 6 to 3 and tube passes from 6 to 1.
3. Total fin surface area is reduced from 30,532 to 11,898.  A reduction of 62%.