Page:NIOSH DM DFM respirator evaluation draft.pdf/25
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WORKING DRAFT 9.15.92—Performance Evaluation of DM and DFM Filter Respirators
17
Table K—NIOSH's 1987 Recommended Assigned Protection Factors for Protection Against Gas/Vapor Exposures.
| Assigned Protection Factor[1] |
Type of respirator |
| 10 | ―Any air-purifying half-mask respirator (including disposable) equipped with appropriate gas/vapor cartridges[2] ―Any supplied-air respirator equipped with a half-mask and operated in a demand (negative pressure) mode[2] |
| 25 | ―Any powered air-purifying respirator with a loose-fitting hood or helmet[3] ―Any supplied-air respirator equipped with a hood or helmet and operated in a continuous flow mode[3] |
| 50 | ―Any air-purifying full facepiece respirator equipped with appropriate gas/vapor cartridges or gas mask (canister respirator)[2] ―Any powered air-purifying respirator equipped with a tight-fitting facepiece and appropriate gas/vapor cartridges or canisters[3] ―Any supplied-air respirator equipped with a full facepiece and operated in a demand (negative pressure) mode[2] ―Any supplied-air respirator equipped with a tight-fitting facepiece and operated in a continuous flow mode[3] ―Any self-contained respirator equipped with a full facepiece and operated in a demand (negative pressure) mode[2] |
| 1,000 | Any supplied-air respirator equipped with a half-mask and operated in a pressure demand or other positive pressure mode[2] |
| 2,000 | Any supplied-air respirator equipped with a full facepiece and operated in a pressure demand or other positive pressure mode[2] |
| 10,000 | ―Any self-contained respirator equipped with a full facepiece and operated in a pressure demand or other positive pressure mode[2] ―Any supplied-air respirator equipped with a full facepiece operated in a pressure demand or other positive pressure mode in combination with an auxiliary self-contained breathing apparatus operated in a pressure demand or other positive pressure mode[2] |
- ↑ The assigned protection factor (APF) for a given class of air-purifying respirators may be further reduced by considering the maximum use concentrations for each type of gas and vapor air-purifying element.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 The APF's were determined by Los Alamos National Laboratories (LANL) by conducting quantitative fit testing on a panel of human volunteers.
- ↑ 3.0 3.1 3.2 3.3 The APF's were based on workplace protection factor (WPF) data or laboratory data more recently reported than the LANL data.
