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Printing Instructions | Text Version
Title: Classes of Nonpowered Air-Purifying Particulate Filters
Type: Text Slide
Nine classes: three levels of filter efficiency, each with three categories of resistance to filter efficiency degradation due to the presence of oil aerosols
- 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).