Massachusetts Plumbers Journeyman Practice Exam

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What is the maximum allowed piping distance from the trap outlet of the automatic vent fitting?

  1. 6"

  2. 8"

  3. 10"

  4. 12"

The correct answer is: 12"

The correct maximum allowed piping distance from the trap outlet of the automatic vent fitting is 12 inches. This requirement ensures that the venting system functions effectively, allowing for proper drainage and preventing potential issues, such as siphoning or back pressure, in the plumbing system. By maintaining this specified distance, it helps ensure that the automatic vent fitting can operate within its designed parameters, allowing air to enter the drainage system at a sufficient rate to balance the pressure as water flows through the pipes. This ultimately promotes good drainage and prevents clogs or blockages that could arise from improper venting. While other distances might be mentioned, 12 inches is the accepted standard that supports the reliable performance of plumbing fixtures connected to the venting system.

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