In order to construct the VFT unit, standard copper tubes with an inner diameter of 8.6 mm were cut into three different lengths of 0.39, 0.69 and 0.99 m
In order to construct the VFT unit, standard copper tubes withan inner diameter of 8.6 mm were cut into three different lengthsof 0.39, 0.69 and 0.99 m