<<< Back to OSHA's Respiratory Protection Standard Link to Printing InstructionsPrinting Instructions | Text Version
 
HOME
Slides 1-10
Slides 11-20
Slides 21-30
Slide 31
Slide 32
Slide 33
Slide 34
Slide 35
Slide 36
Slide 37
Slide 38
Slide 39
Slide 40
Slides 41-50
Slides 51-60
Slides 61-68
Previous  |  Next
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).