What is the maximum number of side by side clothes washers permitted on a 4 inch horizontal waste?

The correct answer reflects the maximum number of side-by-side clothes washers that can be effectively connected to a 4-inch horizontal waste line, which is capped at 22 units. This limit is based on plumbing codes that ensure efficient drainage and prevent blockage in the system.

Plumbing systems require careful consideration of the volume and flow rates of the wastewater produced by each washer. Too many appliances connected to a single waste line can lead to problems such as slow drainage, backups, and even potential overflow. In addition to these flow considerations, the overall design of the plumbing system must accommodate adequate venting to avoid negative pressure and ensure proper operation.

The figures associated with higher numbers, such as 30, 41, and 50, exceed established guidelines, which are designed to maintain optimal functionality and safety in residential or commercial plumbing systems. Adhering to the specified limits is crucial for effective waste management and compliance with plumbing regulations.