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A comment on Experiments on a $50 DIY air purifier (2020). Parent comment

Re:Experiments on a $50 DIY air purifier (2020) by evv555 on Thursday September 02, 2021 @01:58PM (#28395238)
I have seen variations of this used to build laboratory flowhoods. People have been building variations of these in amateur bio labs for the past 20 years and probably longer.
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