Illinois Plumbing Code Practice

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How large should the minimum drain for laundry washer boxes be according to Illinois Plumbing Code?

1 inch

1 1/2 inches

2 inches

According to the Illinois Plumbing Code, the minimum drain size for laundry washer boxes is specified to be 2 inches. This size is essential to adequately handle the discharge from washing machines, which can produce significant wastewater during cycles. A 2-inch drain allows for sufficient flow to prevent clogs, manage the volume of water effectively, and promote proper drainage.

Larger drain sizes help to minimize the risk of overflows and ensure that the system can accommodate peak flow rates during operation. The choice of a 2-inch drain is a standard requirement in many plumbing codes, reflecting best practices for plumbing installations. Adhering to this specification not only helps to maintain the functionality of the drainage system but also supports overall hygiene and safety within the plumbing system by reducing the frequency of backups and odors associated with inadequate drainage.

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2 1/2 inches

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