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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 clear width of a ramp and the clearwidth between handrails, if provided, shall be 36 inches(914 mm) minimum. 1010.5.2 Headroom. The minimum headroom in all partsof the means of egress ramp shall not be less than 80 inches(2032 mm).isleaccessways shall provide a minimum of 12 inches (305mm) of width plus 0.5 inch (12.7 mm) of width for eachadditional 1 foot (305 mm), or fraction thereof, beyond12 feet (3658 mm) of aisle accessway length measuredfrom the center of the seat farthest from an aisle.