Final answer:
The controls, faucets, and shower spray unit in an accessible shower stall with a seat should be installed on the back wall adjacent to the seat wall, and within 27 inches maximum from the seat wall for easy reach.
Step-by-step explanation:
The question refers to the requirements for the placement of controls, faucets, and shower spray units in accessible shower stalls that provide seating for individuals with disabilities. According to the Americans with Disabilities Act (ADA) guidelines, when a seat is provided in a shower stall for accessibility purposes, the controls, faucets, and shower spray unit shall be installed on the back wall adjacent to the seat wall and shall be located 27 inches (685 mm) maximum from the seat wall. This placement is intended to allow individuals to easily reach and operate the shower controls while seated, promoting both safety and independence.