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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 between hand-rails, if provided, or other permissible projections shall be36 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).