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Which gas must never be used to ventilate a confined space where welding is done?

Oxygen, it must never be used for ventilation.

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  1. Pure oxygen ✔
  2. Fresh outside air
  3. Air from a mechanical fan

Why: Oxygen-enriched air makes clothing and other materials burn far faster. OSHA says oxygen shall never be used for ventilation. Use fresh air instead.

Huh, didn't know that: OSHA says all air brought in to replace air pulled out of a confined space must be clean and respirable.

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References

Answer: Pure oxygen. Oxygen-enriched air makes clothing and other materials burn far faster. OSHA says oxygen shall never be used for ventilation. Use fresh air instead.

  1. OSHA 29 CFR 1910.252 General requirements, welding, cutting and brazing www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.252
    Oxygen shall never be used for ventilation.
    Checked 2026-10-10.

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