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

  1. 18 inches

  2. 20 inches

  3. 22 inches

  4. 24 inches

The correct answer is: 24 inches

The correct answer reflects the maximum allowable vertical distance from a fixture outlet to the trap weir, which is set at 24 inches. This measurement is critical in plumbing design to ensure proper drainage and prevent issues such as backflow or improper water flow through the system. Maintaining this maximum vertical distance helps ensure that the water in the trap can effectively prevent sewer gas from entering the living space while also allowing for optimal drainage. Any height greater than this could compromise the effectiveness of the trap, leading to potential problems in both the plumbing system and overall home sanitation. In some plumbing codes, such as those referenced in building regulations, adhering to this standard is essential for maintaining health safety and ensuring the longevity of the plumbing infrastructure, confirming that fixtures are functioning correctly without undue strain on the system.