A DFU (Drainage Fixture Unit) for a single lavatory is usually equal to

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

A DFU (Drainage Fixture Unit) for a single lavatory is usually equal to

Explanation:
Drainage Fixture Units measure the load a fixture contributes to the drainage system so pipes and vents can be sized correctly. A single lavatory is assigned a DFU of one because its discharge is relatively small compared with other fixtures. That means when you’re designing or analyzing a system with one sink, you treat the load as one DFU, which keeps sizing straightforward and aligned with standard tables. Since other fixtures have higher discharge rates, their DFU values are higher, which is why a lavatory is considered to be one DFU. If you add more fixtures, you’d sum their DFUs (for example, two lavatories would amount to two DFUs).

Drainage Fixture Units measure the load a fixture contributes to the drainage system so pipes and vents can be sized correctly. A single lavatory is assigned a DFU of one because its discharge is relatively small compared with other fixtures. That means when you’re designing or analyzing a system with one sink, you treat the load as one DFU, which keeps sizing straightforward and aligned with standard tables. Since other fixtures have higher discharge rates, their DFU values are higher, which is why a lavatory is considered to be one DFU. If you add more fixtures, you’d sum their DFUs (for example, two lavatories would amount to two DFUs).

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