There are probably 5 different modes, 3 of which are automatic modes (one of which is probably sleep mode).
I think the automatic modes are not suitable for virus filtering, as the air purity meter does not respond to viruses.
Especially for filtering viruses, it would be helpful if you could set the maximum fan power to 40, 60 and 80%, for example, so that you have the background noise "under control".
Besides silent mode and maximum mode, is there at least a 50% mode to reduce the background noise a little?
It is somewhat simpler in design:
- There is a sensor that measures the air pollution. It shows you this in ppm on the front display.
- there are 4 manual modes, which are assigned to a certain speed of the fans. Level 1 is slow, 2 faster, 3..., and at the end t = turbo where it is fastest.
- there are 3 automatic modes. In each mode there is a different load = speed curve. I.e. if the first automatic mode slowly revs up a little more at 20ppm, the middle mode is already at a higher speed here.
The names of the modes are... well.
I use it in my bedroom at night (with timer) against dust allergy. I always have it on medium mode. When the unit is running, it has a permanent minimum speed, but it's really quiet. Only if I shake out my blanket (for testing) does the fan go up.
I would say that if you really want to filter against viruses, this is the wrong device. But of course you can switch to a permanent level with the manual modes.
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