3rd part product- flimsy in comparison to original
Though I'd save money and buy these. They are about half as thick as the original charcoal prefilter, so I doubt they will do as an effective job or last as long as the originals.
Not quite as advertised
Confirmed observation by previous reviewer - not the same as a Honeywell-branded filter - about half as thick. Advertising a little misleading which does imply a "Honeywell/Enviracaire" prefilter. I am anticipating my HEPA filter will now clog more quickly unless I replace these about twice as often as I'm used to. The ad should not say "Honeywell" in it.
Needs more activated carbon, generic or not
These generic brand(s) have the same in thickness as the available Honeywell version. Honeywell has changed to a "Universal Replacement" version for all it's prefilters, and yes, they are (all) not as thick as they once were. I have recently used both Honewell and other manufacturer's versions of this product, results seem the same for any maker. Thickness may not be the issue, read on to see why.
The key seems to be the activated carbon component or lack thereof. Some of these prefilters seem almost non-effective to the point I've considered they might be just sprayed/colored black, and could be lacking (or highly under utilizing) any activated carbon. I am concerned about quality control here. The original filters were, at first, terrific, giving a thrilling improvement in my breathing. However, this result dissipated quickly, I suspect because of the surface area of the activated carbon being "used up" in having done it's job.
The "Universal Replacement"...
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