Massachusetts Plumbers Journeyman Practice Exam

What is required to change the diameter of a vent terminal, and how far below the roof surface should it occur?

1. Reducer, six inches

2. Increaser, one foot

3. Connector, two feet

4. Adapter, three feet

The correct answer is: Increaser, one foot

The correct approach for changing the diameter of a vent terminal involves using an increaser, which allows for a smooth transition from a smaller diameter to a larger one, helping maintain proper airflow and preventing blockages in the ventilation system. In terms of placement, it is crucial that the vent terminal extends sufficiently above the roof to avoid any obstructions and ensure effective venting. The recommendation of one foot below the roof surface helps to ensure that the vent terminal is positioned correctly to allow for proper discharge of gases while minimizing the risk of backdrafts and ensuring compliance with building codes. This context helps clarify the importance of using an increaser along with the specified distance, which is based on industry standards and best practices for ventilation systems.