At which trap size does lavatory DFU increase to 2 DFU?

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Multiple Choice

At which trap size does lavatory DFU increase to 2 DFU?

Explanation:
DFU reflects how much wastewater a fixture can contribute to the drainage system and is used to size piping. For a lavatory, the DFU value changes with the trap size because a larger trap (and its corresponding waste pipe) can carry more flow. When the lavatory trap size reaches 1-1/2 inch, the table assigns it a DFU of 2 to account for the greater potential discharge compared to smaller traps. So the lavatory DFU increases to 2 when the trap size is 1-1/2 inch.

DFU reflects how much wastewater a fixture can contribute to the drainage system and is used to size piping. For a lavatory, the DFU value changes with the trap size because a larger trap (and its corresponding waste pipe) can carry more flow. When the lavatory trap size reaches 1-1/2 inch, the table assigns it a DFU of 2 to account for the greater potential discharge compared to smaller traps. So the lavatory DFU increases to 2 when the trap size is 1-1/2 inch.

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