Massachusetts Plumbers Journeyman Practice Exam

Where should the vent branch connection be taken off when the relief vent connections are taken off from the horizontal branch?

1. At the bottom

2. At a horizontal angle

3. At a vertical angle above the centerline of the drain

4. At a diagonal angle

The correct answer is: At a vertical angle above the centerline of the drain

When relief vent connections are taken off from the horizontal branch, it is important to ensure proper venting for the system. In this scenario, the vent branch connection should be taken off at a vertical angle above the centerline of the drain. This allows for proper venting of the system by creating a clear path for air to flow and prevent the build-up of pressure or gas. Taking the vent branch connection off at the bottom (Option A) may result in inefficient venting and potential blockages in the system. Taking it off at a horizontal angle (Option B) or at a diagonal angle (Option D) may not provide adequate ventilation for the system, which could lead to issues with drainage and venting in the long run. Therefore, the correct and best practice in this case is to take the vent branch connection off at a vertical angle above the centerline of the drain (Option C).