Posted by charles on
URL: https://www.es-forum.com/Air-purifiers-tp4029977p4029996.html

All types.
With as well as without fan.
It is inherent to the system.

For electrosensitives, in general, the most damaging frequencies are between 5kHz and 10MHz.
See: http://www.minderstraling.nl/Pagina050.html 

I measured that with a special spectrumanalyzer.
As long as the peaks were in the µV range (microVolt), it was acceptable, but as soon as they were in the mV range (milliVolt), electrosensitives experienced troubles.