| # | Letters of Interpretation |
|---|---|
| 1 | - 1910.134(d)(3)(i)(A) - Use of powered-air purifying respirators (PAPR) for welding operations and assigned protection factor |
| 2 | - 1910.134(d)(3)(i)(A) - APF for the combination pressure-demand, full-facepiece SAR with auxiliary SCBA |
| 3 | - 1910.134(d)(3)(i)(A) - Protection factors for respirators used in pharmaceutical industry: policy change. |
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