Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-09 Illustration GS-RA-09: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option D — A single zone system

A single zone HVAC system utilizes one air handling unit to serve a specific area. It maintains comfort by adjusting the supply air temperature based on the thermostat located within that single zone, providing uniform heating or cooling throughout the entire space served by the ductwork without individual room control.