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2012 Florida Accessibility Code for Building Construction Pocket Guide

505.7.2 Non-Circular Cross Sections. Handrail gripping surfaces with a non-circular cross section shall have a perimeter dimension of 4 inches (100 mm) minimum and 6¼ inches (160 mm) maximum, and a cross-section dimension of 2¼ inches (57 mm) maximum.

Figure (a) shows a handrail with an approximately square cross section and figure (c) shows an elliptical cross section.  The largest cross section dimension is 2 1/4 inches (57 mm) maximum.  The perimeter dimension must be 4 to 6 1/4 inches (100 to 160 mm).

Figure 505.7.2 Handrail Non-Circular Cross Section

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