| fresp_type | is the type of respirator used |
| fFreq_G | is the frequency of respirator use |
| fMaint_R | is the frequency of respirator replacement |
| fMaint_C | is the frequency of respirator maintenance (cartridge replacement) |
| fMaint_Clean | is the frequency of respirator cleaning |
| fseal | is the frequency of respirator seal cleaning |
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