The p100 masks are already certified so you can shop based on cost. Filters + fa... | Hacker News

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		tehjoker 56 days ago \| parent \| context \| favorite \| on: I made a quieter air purifier The p100 masks are already certified so you can shop based on cost. Filters + fans are not certified so you have to know something more to understand what you are getting

tguvot 56 days ago [–]

not the point/example i was making. nm

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