Confined Space Air Monitoring Calculator
Evaluate LEL, O2, H2S, and CO readings against OSHA action levels for permit-required confined spaces.
Inputs
Results
Entry Permitted
1
Immediate Evacuation Required
0
Total Hazards Flagged0
O2 Status (0=Low, 1=OK, 2=High)1
LEL Action Level Exceeded0
H2S Action Level Exceeded0
CO Action Level Exceeded0
How to Use This Calculator
- Enter the confined space volume (cubic feet or m3) and ventilation flow rate (CFM).
- Enter initial and target oxygen concentration (%) and contaminant levels (ppm).
- Read required purge volume and estimated purge time (minutes) to reach safe entry conditions.
- Verify oxygen content is 19.5-23.5% and all contaminants are below IDLH levels before entry.
- Continuous air monitoring is required during entry — use results to establish monitoring intervals.
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