Rhode Island Journeyman Plumber Practice Exam

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How many Drainage Fixture Units are assigned to a residential washing machine and bathtub combined?

The correct answer is: 4

The combination of a residential washing machine and a bathtub is assigned a total of 4 Drainage Fixture Units (DFUs). In plumbing design, each type of fixture is given a specific number of DFUs based on its drainage characteristics and expected usage. A washing machine typically carries a DFU value of 2, while a bathtub is usually assigned a DFU value of 2 as well. When these fixtures are combined, their DFU values can be added together. Therefore, when you add the 2 DFUs from the washing machine to the 2 DFUs from the bathtub, the total becomes 4 DFUs. This reflects the flow and drainage capacity that the plumbing system must handle for both fixtures, ensuring that the system is adequately designed to prevent clogs and maintain proper drainage.