[brnt]

The point is that those systems do not integrate with extractors, and filtering only removed VOCs and particulates, not water vapour, which you would prefer to extract as well.

Heat recovery from an extractor (eg remove heat from air before expelling) would achieve the goal the rating is aimed at, without compromising indoor air quality by not having a way to remove humidity. Or maybe another kind of integrated dehumidifier that discharges in your sink/plumbing maybe.

Those filter-only extractors won't do for anyone serious about indoor air quality.

[fnomnom]

yeah but in my opinion in modern homes this is automated and regulated house-wide with the mentioned air circulators that recover the energy. they also expell humidity afaik

[brnt]

You'll still have to accept an hour or so of elevated humidity. I prefer not to.