Confined Space · 2–5 min toolbox talk
Confined Space Atmospheric Testing Safety
A safety talk focused on proper atmospheric testing techniques and why initial ‘safe’ readings can be misleading.
Use this printed script for your tailgate or toolbox talk. Read through the hazards, script, and questions with your crew.
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“Confined Space Atmospheric Testing Safety”
Key Hazards
- Testing only at the opening and not within the space
- Failing to test at multiple levels
- Relying on one-time tests instead of monitoring
2–3 Minute Talk Script
Confined space atmospheric testing safety is critical because hazardous gases can stratify. Safe air at the top does not guarantee safe air lower in the space.
Testing should be performed before entry and at multiple levels: top, middle, and bottom. Many hazardous gases are heavier than air and collect low, while some hazards can accumulate at higher points.
Testing must be deliberate and slow enough to allow accurate sampling. Rushing gives false confidence.
Even with a safe initial test, conditions can change. Ongoing monitoring and ventilation planning are essential for safe entry.
Safety Reminders
- Test at multiple levels: top, middle, bottom.
- Sample slowly to get accurate readings.
- Do not treat a single test as permanent clearance.
- Re-test after breaks or changes in conditions.
Ask the Crew
- Have we tested the space at multiple levels?
- What could change during the work that affects air quality?