From my understanding the biggest difference is the blades not getting covered i... | Hacker News

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		SamBam on Sept 2, 2021 \| parent \| context \| favorite \| on: Experiments on a $50 DIY air purifier (2020) 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.

ncmncm on Sept 2, 2021 [–]

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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