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SESK: Stuff Everyone Should Know · sesk.info/osha-machine-guarding-fan-blades

Fan blades lower than how many feet above the floor must be guarded?

7 feet, with guard openings no bigger than half an inch.

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  1. 5 feet
  2. 7 feet ✔
  3. 10 feet

Why: If the edge of a fan's blades is less than 7 feet above the floor or working level, the blades must be guarded. Guard openings can be no larger than one-half inch.

Huh, didn't know that: Revolving drums and barrels need an interlocked guard so they cannot spin unless it is in place.

The dad joke
Why did the fan get a guard? It was a big fan of safety.
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References

Answer: 7 feet. If the edge of a fan's blades is less than 7 feet above the floor or working level, the blades must be guarded. Guard openings can be no larger than one-half inch.

  1. 29 CFR 1910.212 General requirements for all machines www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1910/subpart-O/section-1910.212
    When the periphery of the blades of a fan is less than seven (7) feet above the floor or working level
    Checked 2026-10-10.

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