Product review (4 stars): Not like the "originals", but they are OK
When I first unpacked these, I wanted to send them back.  They are nothing like the original filters which came with the humidifier.  I had a back stock of the "original" version, so I haven't ordered any in a while.  They are essentially frameless white pleated paper - much like a coffee filter.  I decided to try them and was pleasantly surprised.  They work about a well and as long as the "original" ones.  You have to be a little careful when putting the cover back on the humidifier, as it's easy to crush the filter.  Otherwise.. works ok.  I'll probably order some more