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What does the "N" in an N95 mask stand for?
- Non-oil:The N95 respirator is an air-purifying respirator which is certified by the National Institute for Occupational Safety and Health (NIOSH). The various ratings assigned to respirators indicate how well the mask protects against oils and are denoted by the letters N, R, or P. The "N" in an N95 mask stands for “Non-Oil.” According to NIOSH, "respirators are rated "N" if they are not resistant to oil, "R" if somewhat resistant to oil, and "P" if strongly resistant to oil." The number "95" indicates that the mask filters out 95% of airborne particles. Thus, an N95 mask is not resistant to oil and filters out 95% of airborne particles.
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