Anyone looking for a quiet fan is out of place here. The noise level is also at level 1 already considerable and increases to level 3 so that you do not want to sit in the same room.
Anyone looking for a quiet machine should take up the following page: (AEG VL 5529 Desk / Wall Fan
The unit I have and at level 1, it makes a pleasant breeze and is virtually silent (with me these days while watching TV)
But back to the wind machine VL 5606: when the air is cooler outside than inside I put it in the open windows on the window sill. In the opposite part of the apartment, I open a window (for the passage) and then let the wind machine 1-2 hours to level 1 or 2 run. Even in absolute calm then a gentle pulling and then the temperature inside is only 0.2 - 0.3 degrees warmer than outside (even though at the start of the action, the difference amounted to several degrees)
In short - the equipment complies to my complete satisfaction precisely the purpose for which I bought it: to create wind, when nature gives me no wind (and cool the rooms to an acceptable level).
And in between the small and faint breath of air is enough for me the little brother of the 5606th
Effciency excellent, excellent price / performance ratio!