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OSHA's Respiratory Protection Standard 29 CFR 1910.134 > Slide 40 Link to Printing InstructionsPrinting Instructions | Text Version
 
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Slide 40
    TEXT VERSION OF SLIDE:

    Title: Classes of Nonpowered Air-Purifying Particulate Filters
    Type: Text Slide
    Content:

    Nine classes: three levels of filter efficiency, each with three categories of resistance to filter efficiency degradation due to the presence of oil aerosols
     
    N
    		 R
    		 P
    100 100 100
    99 99 99
    95 95 95
         
    N is for Not resistant to oil
    R for Resistant to oil
    P for oil Proof

    Speaker Notes:

    - While Part 11 classifications were substance-specific (dust, fume, mist, etc.), Part 84 classifies particulate filters by efficiency and performance characteristics against non-oil and oil-containing hazards.
    - There are nine classes of filters (three levels of filter efficiency, each with three categories of resistance to filter efficiency degradation).
    - Levels of filter efficiency are 95%, 99%, and 99.97%.
    - Categories of resistance to filter efficiency degradation are labeled N, R, and P.
    - Use of the filter will be clearly marked on the filter, filter package, or respirator box (e.g., N95 means N-series filter at least 95% efficient).
 
 
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