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ThompsThomps
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Cowgirl wrote:

They work (no not 100% but every little bit helps):

https://files.fast.ai/papers/masks_lit_review.pdf

I would love to see how the testing was performed and the particle counts. If they put the sensor directly in front of the source, then I can see why they numbers for filtration are high. They should be testing above on the sides, above and below as well. With no seals on masks,the physics says the particles will take the path of least resistance, which is out the sides/top/bottom. https://youtu.be/g_bM1y1IpJY