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What Does P100 Mean?
Respirator filters are rated according to how much particulate matter they can reliably block. A P100 rating is the highest for personal respiratory protection. As long as your
mask fits properly a P100 filter will block 99.9% of particles .3 microns or larger. (If you're interested in the nitty-gritty the CDC has a comprehensive and fairly unreadable guide to particulate respirators.)
In defense of the CDC, there are a huge range of hazards, and not everyone can wax poetic about lun
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Dec 15th 2014