The Helios Fans AFS-Set‑0 – 10V includes two absolute humidity sensors intended for placement both inside and outside the building. When combined with a universal control system such as the EUR EC or a frequency inverter like the FU‑C or FU-CS, these sensors enable differential humidity regulation by controlling the fan through the 0 – 10V setpoint input. This setup can also be adapted for temperature or relative humidity control. The primary application is maintaining dry conditions in spaces like cellars or other rooms requiring controlled ventilation.