What is the fixture unit value for a 1 1/2" bathtub?

The fixture unit value for a 1 1/2" bathtub is 2 FU. In plumbing, fixture units are used to quantify the load a plumbing system must handle, allowing designers to accurately size pipes and design drainage systems.

For bathtubs, the National Standard Plumbing Code assigns a value based on the size and expected usage. A typical bathtub, especially one of this size, generally has a fixture unit value of 2 FU, which reflects a moderate demand on the plumbing system. This value is crucial for ensuring that the drainage and supply systems can adequately accommodate the fixtures without causing issues such as slow drainage or inadequate water supply.

Understanding fixture unit values helps in assessing the overall capacity and effectiveness of plumbing infrastructure in residential and commercial settings.