This is exactly how it works. When the desired humidity has been reached, the humidification system switches off - the air purification continues to work. However, the fan is then automatically reduced in automatic mode. However, the ventilation level can be kept high manually. One more thing to mention: the humidification continues to run minimally even though the module is switched off, which can lead to a slow but steady increase in humidity in small or well-sealed rooms and to the target level being exceeded. This is my experience.