What is the drainage fixture units for a urinal?

What is the drainage fixture units for a urinal?

• A. 2 DFU
• B. 1 DFU
• C. 3 DFU
• D. 4 DFU

Answer: (A)

Drainage fixture units are the sizing metric used to estimate how much a fixture load the drainage system must carry. Each fixture has a DFU value assigned in the code tables, based on typical discharge characteristics. A urinal is assigned two DFU, reflecting its smaller discharge compared with a toilet. This means every urinal adds two DFU to the drainage design. In practice, you sum the DFU values of all fixtures on a line to determine the required pipe size and venting. For example, two urinals would contribute four DFU in total. Remember, DFU is a sizing tool, not a direct measure of flow rate.

Drainage fixture units are the sizing metric used to estimate how much a fixture load the drainage system must carry. Each fixture has a DFU value assigned in the code tables, based on typical discharge characteristics. A urinal is assigned two DFU, reflecting its smaller discharge compared with a toilet. This means every urinal adds two DFU to the drainage design. In practice, you sum the DFU values of all fixtures on a line to determine the required pipe size and venting. For example, two urinals would contribute four DFU in total. Remember, DFU is a sizing tool, not a direct measure of flow rate.