This was recommended to my SIL by her doctor for her lung issues. Works pretty well.
this post was submitted on 09 Jun 2023
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Just be aware that the stronger the filters you use, the faster the fan motor will die trying to pull air through the filters. Probably still cheaper than buying a hepa filter, but you would need to replace the fan every few months, or go for a lower power filter.
The other possibility is to increase the number of higher power filters to decrease the load on the fan.