Since autumn 2018, we have a mechanical ventilation on Droevendaal. The main reason was that the shower tiles can get moldy because of the moisture. Every house has two independent units, one on each side. The control panel works like this:
If automatic, the unit performs between low and high capacity. It can only be switched off by plugging out the power – this is only possible where the attic is accessable, and not the use that Idealis has in mind.
For more information, see the the original manual (Dutch only, sorry..)