Nothing that would stand scientific scrutiny. The odor is certainly removed but that is due to the activated carbon pelts. I did place a white piece of paper that I covered with double sided sticky tape while I printed black filament. I did not collect anything that the eye can see after several hours. That having been said, I have not noticed any particles sticking to the Plexiglass enclosure covers either after 100's of hours operation either. Plexiglass normally has a natural charge on it that typically attracts any dust or dirt. So the questions remain:
I did review some articles on HEPA filters that claim 99.9 efficiency in removing particles of 300 nano meter and larger particles but did not give data on the smaller 10-300 nano-meter particles recorded in some studies.
I my particular case, The filter exhaust port is within 3 feet of an exhaust fan that is moving about 200 CFPM of air constantly. Hopefully this would carry any UFP that is airport outside the structure.