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The minimum width of stairways is 36. Handrails may project into the required width a distance of 3 Â½ from each side of a stairway. Stringers and other projects such as trim and similar decorative features may project into the required width 1 Â½ on each side.
The OSHA [exit route] requirements, [ 1910.36(g)(2)], state that the minimum width of any way of exit access shall in no case be less than 28 inches. Stairways, which are not used as an exit or emergency, according to 1910.24(d), may have a minimum stair width of 22 inches.