Honeywell Easy Fit-n-Set Replacement Air Filter - 40190

Comment: These might have to be cut, ripped or torn to fit, depending which filter you have. That can be a hassle, but the filters do the job they're supposed to. (You can tell by how dirty they get.)

Comment: We have been using the Honeywell filtre in our air cleaner for several years now and found that it works very well. When we do our periodic cleaning of the filter we are always amazed at how much dust and dirt it has collected. Which means that the air we are breathing is much cleaner.

Comment: The theory behind this refill is that there is one perforated filter per box that can be broken in half for use as 2 filters with the Honeywell 40100 series air purifier.

That, at least, is the theory...

In reality, the filter is perforated as advertised; however, there is so much glue along the perforation holding the accordion folds together, that it is virtually impossible to break the filter in half.

I tried to break it by just flexing the perforation, as the directions indicated. It didn't separate. I tried flexing it harder and bending it back and forth to break them apart. The glue started separating at the folds. The glue coming apart caused the filter to open up at some of the accordion folds, so the filter was no longer round. I tried a knife to cut the two filters apart. Ditto on breaking up the accordion folds. Finally resorted to a hacksaw to separate them.

The only bright thing of the whole fiasco - they did finally work when I crammed them into the units.

After effectively almost destroying the filters I called the manufacturer (Honeywell) and they indicated that these are not the filters that they sell. They are an aftermarket item with the Honeywell logo. Honeywell does not endorse them. Surprise, surprise! They recommended that you only buy the replacement HEPA filters sold on the Honeywell website for the model 40100 air cleaner. I second that recommendation -- wholeheartedly!