Product review (5 stars): Great replacement for an Essex MoistAir MA0800 Evaporative Humidifier
The original filter was pretty dirty after a year of use (fall/winter/early spring) - we were only getting max in the upper 30's/low-40's from the humidifier with the old filter - even with the humidifier set at 50.

The MAF2 is the recommended replacement filter for the Essex MA0800. Once we replaced it, we were now getting the numbers we had the humidifier set at for the dry winter: 47-50

Replacing it takes 2 minutes.
Top lifts off, tuck the filter around the center in the tracks, put top back on. Done.