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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 SamBam on Thursday September 02, 2021 @02:32PM (#28395629)
From my understanding the biggest difference is the blades not getting covered in grime, because you're pre-filtering the air.

I've also heard airflow dynamics arguments, but I feel like I've heard them argued in both directions.

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Re:Experiments on a $50 DIY air purifier (2020) by ncmncm on Thursday September 02, 2021 @04:09PM (#28396743)
You can use two fans, one on intake, one on exhaust. Or three, if you have a particularly fine filter. But building another whole unit to run in another room might be better.

With a #9, one-inch filter, a single fan does fine.

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