Do office chairs require a 5 prong star base?

While a 5 pronged chair is not required, it is highly recommended for stability purposes.  Again, the recommendation comes from the Human Factor Design Factors Book 2nd Edition.  Don’t have the book, get a copy on Amazon here

Check the very bottom of OSHA webpage below for the reference to the 5 prong chair.

Cal-OSHA governs ergonomics in Section 5110

Standards for chairs can be found here:

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