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Respirator filters are rated according to how much particulate matter they can reliably block and what environments they’re best suited for. This is why you’ll see respirators and filters with names like N95 or P100. The letter refers to how resistant the product is to oil, how tightly the material is woven, and the static charge contained in the material. The number represents the percentage of particles that are filtered out. When it comes to personal respiratory protection, P100 is the h …