operating oxygen level for hypoxic fire-prevention vs 20.9% ambient; governed by EN 16750
15–17% O2observed
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2025 |
| Source | EN 16750 (hypoxic fire-prevention); Assured Automation · Protected-area access requirements; operating oxygen concentration shown as >15–17 Vol.% and discussed in connection with EN 16750 |
| Review | checking…review by 2026-10-27 · standard cadence |
| Recorded changes | last 2026-07-21 · 2 revisions tracked |
| Claim id | operating-oxygen-level-for-hypoxic-fire |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.