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Which of the following is not a requirement for a barrier-free washroom in an industrial 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 requirement for a barrier-free washroom in an industrial building includes having a barrier-free entrance, grab bars, and a sink with knee clearance. A bathtub with built-in seat is not a requirement as it may not be feasible or necessary in an industrial setting. The other options are essential to make the washroom accessible for individuals with disabilities or mobility limitations.