Due to the fact that the natural phenomena of equalization (balancing unstable conditions by flow) humidity from the ambient is able to penetrate compressed air piping even the air is pressurized. As a normal compressed air system has countless connection points through which humidity enters the piping. This results in influencing the dew point negatively. The effect has to be considered for applications where the dew point is critical and therefore point of use is the only reliable way to avoid any risks for the production.