Hunter 30917 Replacement Filter for HEPAtech Air Purfiers

This is not a HEPA filter, since it does not meet HEPA standards in terms of particle filtration efficiency. Putting "HEPA" in the name is deceptive, and allows to sell a cheap item for several times the price.

I got this to test the filter media to see if it can be used for a true HEPA application in an electronics room. We have tested this filter at 60 CFM using an APC plus particle counter and got the following readings (presented as counts in the 0.3, 0.5, 1.0, and 5.0 micron ranges). Numbers are accurate to within 10%.

Ambient air:
20565, 1125, 254, 0

Hunter-Filtered air:
2102, 51, 32, 0

Positive control (true HEPA filter - we used a Whatman HEPA-CAP here to make sure the counter is accurate)
0, 0, 0, 0.

Thus, this filter is ~90% efficient - which should be enough for the most folks to achieve an allergy relief, but also could be achieved by a variety of much cheaper electrostatic filters rated above MERV10...Read more

My wife picked up a set of Hunter air purifiers on QVC. The price of replacement filters is outrageous. Nothing special about them and I don't really notice an improvement in air quality.

This was the cheapest place and one of the very few places to purchase the replacement filters. I have replaced the filters only once. they were pricey and I expected that when I realized I could not get them at the corner hardware store or bulk item store. I rated the filters with 3 stars for this reason only. The filters work fine.