What is the minimum size for a commercial laundry trench in terms of trap size?

The minimum size for a commercial laundry trench in terms of trap size is 4 inches. This specification is grounded in plumbing codes and standards that seek to ensure adequate flow and drainage for the large volumes of water and potentially debris produced in commercial laundry operations. A 4-inch trap is designed to handle the high flow rates associated with multiple washing machines operating simultaneously, thus preventing clogging and ensuring efficient drainage. Additionally, larger trap sizes help mitigate the risk of sewer gas backflow and potential obstructions that can occur with smaller traps, ultimately promoting better hygiene and operational efficiency in commercial laundry settings. This understanding is essential for any plumbing professional working with commercial laundry configurations to ensure compliance with local codes and effective system performance.