Product review (3 stars): Dimensions are okay and they fit fine, however the material has a certain "grain" to ...
VERIFY that they are cut correctly before using. Dimensions are okay and they fit fine, however the material has a certain "grain" to it the must be correct to wick the water up correctly. It took me awhile to realize why my humidifier wasn't consuming water as quickly as it used to(and therefore humidifying the air). The "grain" needs to be oriented vertically rather than horizontally, otherwise it will not not allow water to wick completely through it and will only stay damp about halfway up. Had I noticed this sooner I would have contacted the seller for a replacement. Unfortunately for me I didn't notice until I changed the filter today and compared it to a new one.  Live and learn.  See the attached picture for reference.  The top filter is new and cut correctly, while the bottom filter is what I just took out.