ADAAG Manual

Seating [4.32.2] and Knee Clearance [4.32.3]

Knee space at least 27 inches high is required for a depth of 19 inches. The over-the-surface reach is limited to 25 inches if at least this much space is available below for knees and toes; (the forward seated reach may not extend beyond the toes). Maneuvering space is important where turning is required into the space.