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re: Any face covering is fine, guys
Posted on 6/30/20 at 7:01 pm to Presidio
Posted on 6/30/20 at 7:01 pm to Presidio
That article is wrong. 0.3 microns are used to test respirators because they are the most penetrating particle. Particles smaller than 0.3 microns are captured more efficiently by diffusion and electrostatic attraction.
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