3 ms·
They'll usually advertise it, or you can tell if they don't require a filter and are 'cool mist' then it's likely ultrasonic. The other types of humidifiers us
by qbasic_forever 5y ago
They'll usually advertise it, or you can tell if they don't require a filter and are 'cool mist' then it's likely ultrasonic. The other types of humidifiers use a fan blowing over a filter/wick that absorbs water, or generate steam (i.e. warm mist).