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SESK: Stuff Everyone Should Know · sesk.info/osha-confined-spaces-permit

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

A possible hazardous atmosphere, or another serious hazard.

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

Why: A permit space has at least one of these: a possible hazardous atmosphere, material that could engulf someone, a shape that could trap someone, or another serious hazard.

Huh, didn't know that: Air with less than 19.5 percent oxygen is called oxygen deficient.

The dad joke
Why dont confined spaces tell jokes? They need more room to breathe.
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References

Answer: It may contain a hazardous atmosphere. A permit space has at least one of these: a possible hazardous atmosphere, material that could engulf someone, a shape that could trap someone, or another serious hazard.

  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
    Contains or has a potential to contain a hazardous atmosphere
    Checked 2026-10-10.

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