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A comment on Build a do-it-yourself home air purifier for about $25.

Re:Build a do-it-yourself home air purifier for about $25 by rustychris on Wednesday November 14, 2018 @02:45PM (#18453178)
In case you're curious how this does with wildfire smoke -- Oakland 1 bedroom, put a 14"x20" MERV 13 (filtrete blue) filter on a box fan (covering the extra 6" with paper). Had a PMS5003 from adafruit monitoring before and after. In the span of 3 hours indoor PM2.5 dropped from 25 to 5 ug/m3 and has stayed low since.

https://imgur.com/IxdxhV2

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