I would not recommend the level of HEPA/charcoal filtration that I have described to anyone who is not incredibly sensitive to mold and/or allergens. It's also important from those reading my posts to realize that filtration is only one facet of my environmental control measures.

If someone wants to start practicing environmental control I would recommend reading through text and watching the videos at (https://www.aaaai.org/tools-for-the-public/conditions-library/allergies/indoor-allergens-ttr). The only thing that you should ignore is the statement in the second video that "for the most part molds don't cause human disease." This is clearly not the case and is contradicted by several articles in JACI and JACI In Practice (the journals published by AAAAI).

If they want to see if room-sized particulate filters work for them they might want to start out with a Corsi-Rosenthal Box. It doesn't have any charcoal in it but it is much cheaper than the Foust and AllerAir units that @jenniferhunter and I have been talking about.

There is detailed info on the box (including instructions on how to build one) at the Corsi-Rosenthal Foundation website (https://corsirosenthalfoundation.org/ ) and a video interview with Jim Rosenthal at (https://www.iaqradio.com/jim-rosenthal-chief-executive-officer-tex-air-filters-air-cleaning-filtration-and-the-corsi-rosenthal-box/)