MultiStep® saves 50-70% of the total power consumption for ventilation compared to traditionally controlled air outlets. This saving can be optimised further by using a stepless, frequency-controlled fan. Furthermore, MultiStep® ensures a better pressure stable and less wind sensitive ventilation system.

The exhaustion principle combines stepless control with group control of the exhaust units in the house. The climate computer controls one fan steplessly from 0 to 100%. At 100% ventilation, MultiStep® connects the next fan at 100%, after which the steplessly controlled fan starts all over again at 0%.