HVAC Journeyman Practice Exam

Which of the following is NOT a listed option for air flow in a duct system?

1. A diverter unit

2. A cooling coil

3. Heat pump

4. A bypass duct

The correct answer is: Heat pump

In the context of duct systems, airflow options typically refer to components that directly facilitate or manage the movement of air within the HVAC system. A heat pump, while an essential component in heating and cooling systems, does not function as part of the ductwork itself. Instead, it serves as the mechanism that transfers heat, working in conjunction with the duct system but not being part of the airflow pathway. On the other hand, a diverter unit is instrumental in redirecting airflow, allowing for distribution to different areas. A cooling coil acts as a component that cools the air passing over it, actively participating in the conditioning process. A bypass duct is designed to redirect excess airflow, ensuring that the system operates efficiently and that there is balanced air distribution throughout the system. Thus, among the given options, the heat pump stands out as not being part of the airflow management or distribution within a duct system, making it the correct answer.