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respiratory protection filter classifications with the niosh 42 cfr ... 84 standard nine classes of filters three series of filters with three ... levels of filter efficiency were developed the series ... are referred to as n r and p the three different levels of ... 99.97 against the most difficult size particle to filter n series filter these ... filters are restricted to use in those ... used for any solid or liquid airborne particulate hazard that does not contain oil ... generally these filters should be used and reused subject only ... and increased breathing resistance n95 particulate filter ­ at least 95 filter efficient ... tested with ~0.3 µm nacl aerosol n99 particulate filter ­ at least 99 filter efficient ... tested with ~0.3 µm nacl aerosol n100 particulate filter ­ at least 99.97 filter ...