WORKING DRAFT 9.15.92—Performance Evaluation of DM and DFM Filter Respirators
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Table B—OSHA’s 1976 Assigned Protection Factors for Gas Or Vapor Respirators.
| Concentrations in Multiples Facepiece of permissible exposure limits |
Facepiece Pressure |
Permissible Respirators |
| 10X | - | Quarter or half-mask chemical cartridge respirator with "Name" cartridges or canister half mask, supplied-air |
| 50X | - | Full facepiece gas mask or chemical cartridge with "Name" cartridges or canister |
| - | Full facepiece SCBA | |
| Full facepiece supplied-air | ||
| 1,000X | + | Half-mask, supplied-air |
| 2,000X | + | Supplied-air with full facepiece, hood, helmet or suit |
| 10,000X | + | Full facepiece, SCBA |
| + | Full facepiece supplied-air with auxiliary self-contained air supply | |
| Emergency entry into unknown concentrations or firefighting | + | Full facepiece SCBA |
| Escape only[1] | + | Any full facepiece SCBA |
| - | Gas mask with a "Name" canister | |
| - | Any self rescure |
- ↑ In an atmosphere which is immediately dangerous to life or health.
| Notes: | 1. The "Name" means approved chemical canisters or cartridges against a specific contaminant or a combination of contaminants Such as organic vapor, acid gases, organic vapor plus particulates or acid gases plus organic vapor.
2. Quarter or half-mask respirators should not be used if eye irritation occurs at the use concentration. 3. Full facepiece supplied-air respirators should not be used in any atmosphere which is immediately dangerous to life or health unless it is equipped with an auxiliary air supply which can be operated in the positive pressure mode. |
