Good purifier

A very simple to use device that can purify the air in your rooms.
Given for 28m square it seems to me, nothing prevents its use in larger rooms.
The automatic mode is ideal, as it adapts the power of filtering depending on the quality of ambient air.
The result is not necessarily verifiable, but ve the filter that there is inside, there is no doubt about filtering.
The unit is fairly quiet, even at night, so of course it does not turn up.
Provision should be made to change the filter regularly (depending on the amount of particles in the air), when the device will indicate.
In short, a good device which unfortunately is a little too expensive.