Openings [§302.3]
Openings in ground and floor surfaces, such as grates, are limited in width to prevent passage of a ½” diameter sphere. Wheelchair casters can get wedged into wider openings.
Surface Opening (Cross Section)
Elongated openings, like those of most grates, must be oriented so that the long dimension is perpendicular to the dominant travel direction. In locations where there is no dominant flow pattern, openings must be limited to ½” in both dimensions. Where an accessible route is available to bypass openings completely, they can be oriented in any direction.
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