What is the maximum allowed distance for a vent to be installed from a trap?

The correct response, which indicates a maximum allowed distance of 10 feet for a vent to be installed from a trap, aligns with plumbing code requirements in Massachusetts. Proper venting is crucial because it allows air to enter the plumbing system, helping to maintain neutral pressure and prevent siphoning or backpressure that can lead to drainage issues or trap seal loss.

By keeping the maximum distance for the vent at 10 feet from the trap, it ensures that wastewater can flow down properly while also allowing gases to escape without creating a vacuum that could affect the trap’s functionality. This distance is established to ensure that the vent is effective in promoting adequate airflow and proper drainage, minimizing the chance of foul odors or backups.

In the context of other potential distances, 5 feet, 15 feet, and 20 feet do not adhere to the code requirements. For example, a shorter distance would not provide sufficient room to handle venting for more complex plumbing configurations, while a longer distance could lead to inefficient venting and potential plumbing code violations.