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Which feature makes a confined space a permit-required confined space?

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  1. It is below ground level
  2. It may contain a hazardous atmosphere
  3. It has only one door

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References

  1. 29 CFR 1910.146 Permit-required confined spaces www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-J/section-1910.146 Checked 2026-10-10.

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