Product review (4 stars): works fine but...
These filters work fine; but my humidifier that these fit use two filters - why on earth is this a set of 3?  Why not a set of 4 - strange. I seem to fly through them also - which I'm not sure is a result of the humidifier or the filters - but it's already telling me to 'replace' the filter and I didn't buy these too long ago. I guess it's ok since I'll have another full set after purchasing another box but strange way to package them, they should consider a redesign!