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 serves one specific area with a single supply duct and thermostat. It typically includes a preheat coil, cooling coil, and reheat coil to manage the temperature of the air supplied to the zone, providing centralized control for a single space or group of spaces.