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2010 ADA Standards for Accessible Design Pocket Guide

610.3.2 L-Shaped Seats.

The rear edge of an L-shaped seat shall be 2½ inches (64 mm) maximum and the front edge 15 inches (380 mm) minimum and 16 inches (405 mm) maximum from the seat wall. The rear edge of the “L” portion of the seat shall be 1½ inches (38 mm) maximum from the wall and the front edge shall be 14 inches (355 mm) minimum and 15 inches (380 mm) maximum from the wall. The end of the “L” shall be 22 inches (560 mm) minimum and 23 inches maximum (585 mm) from the main seat wall. [S.H. 4.21.3]

Figures (a) shows the “L” is oriented with the narrower portion toward the compartment opening and the base toward the back.  The front edge of the narrow portion of the “L” is 15 to 16 inches (380 to 405 mm) from the seat wall and the base end is 22 to 23 inches (560 to 585 mm) from the seat wall.  The base of the “L” is 14 to 15 inches (355 to 380 mm) from the adjacent wall.
Figure (b) shows that the seat is 2 1/2 inches (64 mm) maximum from the seat wall and the rear edge of the L portion is 1 1/2 inches (38 mm) maximum from the adjacent wall.

Figure 610.3.2 L-Shaped Shower Seat

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