Product review (5 stars): As described.  Fits fine.
Fits my unit fine as described and works great.  I'm not a big fan of the split (non-circular) filters but being unable to find any other type of filter for my humidifier, I came up with a fix...I use small plastic zip-ties (wire ties) to close the end of the filter together so it would not leak air past the humidifying element and it worked great.