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I bought my first Holmes HEPA air filtering machine more than a decade ago, and have been satisfied enough not to have bought any other brand since then, although I have had four Holmes air filter machines since then.

The first model I bought (I think it was the 220) is apparently discontinued, but it would be no exageration to call it a life-saver. I bought my first one because I lived in a house with a HEAVY chain smoker. Even though rated for only a single small room, that little sucker grabbed enormous amounts of smoke and the white paper on the filter blackened within weeks from particulate cancer-causing material which it saved me from inhaling. The next two filter machines I bought for a house which was infested with black mold. The one closest to the worst mold area blackened very quickly, while the second one, further from the mold, only grayed somewhat in the same time period -- the filter was very obviously cleaning potentially deadly black mold spores from the air.

The model I have now uses the HAPF30 replacement, and it is doing "light duty" compared to the first three I owned. I would have given this five stars except that I have the very distinct impression that this particular filter replacement is less efficient than the earlier ones I owned -- the filter has grayed with use, but I don't have the impression that the color change has been due entirely to grabbing airborne pollutants; I suspect (but don't have any evidence) that the filter is catching carbon which is being blown forward by the fan or else is catching dust which the negative ions generated by the machine itself have caused to fall.

Despite my suspicion that this is less efficient than earlier models, I still rate it four stars because I know that it is filtering SOMETHING out of the air, and I trust the Holmes brand -- they have earned my confidence through many years of arduous work. (I've never experienced any mechanical problems with one, either, until long, long after the warranty has expired. These things are real workhorses.) If the fans on the machines are kept to low settings they are fairly quiet, but at high speed they genrate quite a bit of noise, which can be a blessing in itself since the machine can act as a "white noise" generator to mask *noise* pollution, too.

This Holmes filter was exactly what I needed for my air purifier. I use my machine daily & I recently couldn't find the filter in any local stores. It works wonderfully.

Does the job. Small size fills with allergens much faster than a large unit. For the small size it works great but plan on replacing every 90 days if you use your unit constantly.

This filter is HEPA type rather than HEPA, so I know it's missing some microbes, but it's grabbing enough that I can breathe much easier in the room where I use it. I live with a smoker and a cat, so I need all the dust-grabbing help I can afford.

I'm using this filter in a Holmes HAP2400 that runs almost constantly, alternating between settings 2 and 3. It's been running pretty much steadily for three months, and the filter is gradually darkening, but it's not all used up yet. I have a washable booster filter that I rinse out once a month, so I think that might be extending the natural life of this filter a little bit.

All in all, this is an allergen-reducing solution that I can afford and, combined with some other measures like heavier-duty filters in the intake vents of the house, it's been working out great, no complaints. I'd recommend both the air purifier and the filter to others who need to reduce air borne allergens in the home.

This is a great filter, doing what it promises. It is very easy to install and remove. One of Amazon's sellers, Target, had it cheaper than anywhere else and will buy another this way next time.

it fit my air cleaner just fine. But it seems to be filling up with dirt extremely fast.

I needed the filter form my Holmes air purifier. It was the correct type and was delivered in a timely fashion.

These replacement filters work well in my Holmes air filter. Remember to order two since there is only one per package!

These are high quality affordable filters for my Holmes air purifier. Even my pets sneeze less when the purifier is running! The filters really help to keep the air in our house cleaner!

Not really much to say here. It's an inexpensive replacement filter that fits and does it's job.
The only small wrinkle I had was that for some reason, the models listed in the Amazon listing don't exactly match the models on the box I received. The filter still fit properly, but I found it odd that my model wasn't listed on the box (HAP 240, not 2400). Was it a typo? Was it a lazy listing by the person who created this? Not really sure, and I guess I don't really care all that much, thus the 4 stars.