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What is the maximum vertical distance allowed from the fixture outlet to the trap weir?

  1. 12 inches

  2. 24 inches

  3. 18 inches

  4. 36 inches

The correct answer is: 24 inches

The maximum vertical distance allowed from the fixture outlet to the trap weir is 24 inches. This regulation is typically established to ensure proper drainage and prevent potential issues such as siphoning, which can lead to sewer gases entering the living space. When the distance from the fixture outlet to the trap weir exceeds this limit, the risk of improper drainage increases, which can cause slow drainage or backups. By maintaining this distance at 24 inches or less, plumbing systems promote better flow dynamics and ensure that traps can effectively retain water to seal against gas intrusion while still allowing waste to pass through adequately. This specification is essential for plumbing installations to function correctly and efficiently.