| Normalized vest conc. | = Resultant normalized sample vest concentration using ventilation for the entry (mg/m3). |
| Sample vest conc. | = The sample vest concentration for the entry (mg/m3) |
| Ventilation quantity | = The ventilation air quantity of the entry (cfm) |
| 3000 | = The minimum airflow quantity for an entry specified by MSHA [13] |
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