Product review (4 stars): As far as replacements go, these are fine and at least they're cheaper than other replacements
I've given up trying to buy the filters from the manufacture of my EssickAir (MAF 1); they get gunky too fast and are expensive, if you can even find the real ones on Amazon (horrendous quality control, people should be ashamed of themselves with the lies they post about the item being the authentic filter for the product and not a replacement).  These work great, they just don't last too long, which isn't too much of a problem at this price. I went through 2 of them this winter.  This is what I'm going with from now on.  I have tried a ton of different replacements and these work well, are the cheapest ones I've found, and are shipped flat so you don't have to find a place to put the big cube boxes the other replacements come in.  These lie flat so they are easy to store.