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 one can get at HomeDepot.
The federal HEPA standard is 99.97% particle removal at 0.3 microns and this filter is more than 2 orders of magnitude (factor of 100+) below this rating. The media appears to be polypropylene and has a surface area at least an order of magnitude smaller than a true HEPA filter which is not surprising.
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