The following knee and toe clearances are required underneath a lavatory: 8 inches (205 mm) minimum measured from the front edge underneath the lavatory back towards the wall, and a toe clearance 9 inches (230 mm) minimum high, measured a maximum 6 inches (150 mm) from the wall. A minimum 27 inches (685 mm) clear space is required underneath the lavatory bowl. (4.19.2, 4.19.6)

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