2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
1018.3 Aisles in Groups B and M.
In Group B and M occupancies, the minimum clear aisle width shall be determined by Section 1005.1 for the occupant load served, but shall be not less than that required for corridors by Section 1020.2.
Exception: Nonpublic aisles serving less than 50 people and not required to be accessible by Chapter 11B, (see Section 11B-403) need not exceed 28 inches (711 mm) in width.
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