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Which of the following is not a requirement for a barrier-free washroom in a commercial building?

  1. Grab bars

  2. Barrier-free entrance

  3. Sink with knee clearance

  4. Bathtub with built-in seat

The correct answer is: Bathtub with built-in seat

A bathtub with a built-in seat is not a requirement for a barrier-free washroom in a commercial building. This is because a bathtub with a built-in seat is not accessible for people with mobility impairments. Having a knee clearance sink, grab bars, and a barrier-free entrance are all necessary features to make a washroom accessible for individuals with disabilities. These features allow for easier navigation and use of the washroom for those with mobility impairments, whereas a bathtub with a built-in seat only caters to a specific group.