These architectural clearance diagrams detail wheelchair maneuvering dimensions in alcoves for forward and parallel approaches, alongside stair vertical clearance requirements. The forward approach alcove requires a minimum width of 36 inches with a depth greater than 24 inches. The parallel approach alcove requires a minimum width of 60 inches with a depth greater than 15 inches. The stair diagram outlines a maximum 27-inch height for protruding objects below a vertical clearance limit of 80 inches.
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