Massachusetts Plumbers Journeyman Practice Exam

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What is the minimum size required for a main stack vent or vent stack in a structure with a building drain?

  1. Two inches in diameter

  2. Three inches in diameter

  3. Five inches in diameter

  4. Six inches in diameter

The correct answer is: Three inches in diameter

In plumbing systems, the minimum size required for a vent stack in a structure with a building drain is typically three inches in diameter. This size is necessary to ensure proper ventilation and allow for the proper flow of air to prevent vacuum and siphoning effects in the drain system. Choosing a smaller diameter for the vent stack could lead to issues with air pressure balance and proper drainage within the system. Therefore, a three-inch diameter vent stack is the correct minimum size for ensuring the efficient and effective functioning of the plumbing system.

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