This can be break down to two questions: Is the air coming out of the DIY purifier clean? and is that enough to actually clean the ambient room air?
We have done real room test in a two-window 13.5 sqm bedroom and recorded the detailed data. The brief answer to this question is: the DIY works, and it can clean the air in a space up to 15 sqm. The safest way is to test the air quality with a particle counter, so you see by yourself. Click here to see the full article: https://smartairfilters.com/en/blog/diy-purifier-tests/
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