Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-43 Illustration GS-RA-43: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option A — A dual duct system

Dual duct systems utilize two separate supply ducts—one for cold air and one for warm air—that run to mixing boxes located in each zone. The mixing boxes blend these air streams in response to local thermostats, providing highly flexible temperature control for different areas throughout the vessel.