Master Plumber Practice Exam 2025 - Free Plumber Practice Questions and Study Guide

Question: 1 / 400

At what minimum distance should a vent pipe terminate above the roof?

12 inches

24 inches

The minimum distance at which a vent pipe should terminate above the roof is 24 inches. This requirement is grounded in plumbing codes and best practices to ensure proper ventilation and to prevent the risk of sewer gases from entering the building.

Terminating the vent pipe at this height creates a clear pathway for the gases to disperse into the atmosphere, which helps maintain a healthy indoor air quality. Additionally, a vent that is positioned at least 24 inches above the roof is less likely to be obstructed by snow or ice, and it minimizes the chances of it being blocked by any roofing features, such as parapets or other structures.

When considering the options that suggest lower termination heights, those heights do not provide adequate clearance against such obstructions or ensure effective venting, thus making the 24-inch standard the most reliable choice for vent pipe termination.

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36 inches

10 inches

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