Why is "high" the first setting after "off" on air purifiers?

For example, on all the different kinds of air purifiers I have it always goes something like this on the speed dial:

Off – High – Medium – Low

Do you recognize the weirdness of this? Is there a sort of technical reason to do this, or is it a peculiar user convenience factor, or are they just toying with our mind’s to see if anyone notices it?

I think it would make more sense if they were something like this…
Off-Low-Medium-High
… then it is at least in a logical ascending order.


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