Each high-efficiency Hepa-Type filter helps remove up to 99% of airborne dust and pollen as small as 2 microns from air passing through the filter. They also help reduce smoke, mold spores and pet dander. Each filter is enhanced with Arm & Hammer® baking soda to help absorb and eliminate common household odors. These filters are meant to be used in Holmes® brand air cleaners but can also be used in Bionaire® brand air cleaners.
Customer Reviews:2010-07-20 | DJ Urban Cowboy (NY, NY) | Rating: 5
New filters in beat up packaging worked fine.2010-04-24 | Rating: 5
Great buy. Also works with Bionaire BAP-14122010-03-03 (USA) | Rating: 5

If you purchase an air purifier, you will, no doubt also have to replace Hepa Filters every so often. They are not inexpensive, so you will need to search for the best price. This particular filter for the Holmes Air Purifier, is very easy to access and replace. It is supposed to last for one year, however, will probably depend on how much particulate matter it has to deal with. I replaced my 3 after 3 months. Hopefully, the next group will last longer.
Source: Buy Holmes Replacement Modular HEPA Filter for Air Purifiers, 10 x ...