Wheelchair maneuvering clearances in an alcove with a forward approach require a minimum width of thirty-six inches and a depth greater than twenty-four inches. Parallel approach in an alcove requires a minimum width of sixty inches and a depth greater than fifteen inches. Vertical clearance beneath stairs requires a maximum barrier height of twenty-seven inches at a point where the headroom is less than eighty inches, measured per California Building Code Chapter 11B.
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