| # | Letters of Interpretation |
|---|---|
| 1 | - 1910.134(b) - Filtering facepiece respirators and medical evaluations |
| 2 | - 1910.134(b) - Numerous questions on filtering facepiece/dusk mask respirators. |
| 3 | - 1910.134(b) - OSHA's decision not to provide a religious exemption from the respirator standard. |
| 4 | - 1910.134(b) - Classification of fires; respiratory protection to extinguish fires. |
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