SECTION P-421 SHOWERS
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P-421.3 Shower waste outlet. Waste outlets serving showers shall be not less than 1-1/2 inches (38 mm) in diameter and, for other than waste outlets in bathtubs, shall have removable strainers not less than 3 inches (76 mm) in diameter with strainer openings not less than 1/4 inch (6.4 mm) in least dimension. Where each shower space is not provided with an individual waste outlet, the waste outlet shall be located and the floor pitched so that waste from one shower does not flow over the floor area serving another shower. Waste outlets shall be fastened to the waste pipe in an approved manner.
Exception: A linear shower drain shall be permitted when sized and installed in accordance with the linear drain manufacturer. The area of any linear shower drain shall be a minimum of 7 square inches (4516 mm2).  357
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Notes

357
   Added, Bill No. 230653 (approved December 20, 2023), effective April 1, 2024.