Comment by js2

True HEPA means exactly what it says: HEPA as defined by the US EPA.

E12 is NOT a HEPA filter. Which is why it's called E12. HEPA starts at H13 and H14. This is right in the wikipedia page TFA links to:

> The specification used in the European Union: European Standard EN 1822-1:2009, from which ISO 29463 is derived, defines several classes of filters by their retention at the given most penetrating particle size (MPPS): Efficient Particulate Air filters (EPA), HEPA and Ultra Low Particulate Air filters (ULPA).

https://en.wikipedia.org/wiki/HEPA#Specifications

So the IKEA filter is an Efficient Particulate Air filter, but not a HEPA filter.

There is nothing wrong with The Wirecutter's review. TFA's allegation that The Wirecutter dismissed the IKEA filter because they don't get an affiliate fee from IKEA is without evidence or merit. The Wirecutter does in fact recommend other IKEA products:

https://www.nytimes.com/wirecutter/reviews/best-stuff-from-i...

The Wirecutter is not a perfect site, but it's where I often start my product research and it has yet to let me down.