Page:NIOSH DM DFM respirator evaluation draft.pdf/14

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Performance Evaluation of DM and DFM Filter Respirators—WORKING DRAFT 9.15.92

Table A—OSHA's 1976 Assigned Protection Factors for Particulate-Filter Respirators

Concentrations in multiples
of permissible exposure limits		 Facepiece
Pressure		 Permissible Respirators
5X - Single use dust
- Quarter-mask dust
10X - Half mask dust
- Half- or quarter mask, fume
- Half- or quarter mask, high-efficiency
50X - Full facepiece, high efficiency
1,000X - Powered, high-efficiency, all enclosures

Note: Half-mask and quarter-mask respirators should not be used if the particulate matter causes eye irritation at the use concentration.

Centers for Disease Control
Centers for Disease Control
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