General Subjects (Auxiliaries & Systems) USCG Question #1427 (Set 22)

What type of HVAC system is characterized by having control dampers in locations other than the outside air supply, outside air exhaust, and recirculation damper applications?

Official USCG Answer & Rule Citation

Correct Answer: Option D — A variable air volume system

Variable air volume (VAV) systems employ terminal control dampers to regulate the quantity of air delivered to a space based on thermal load. Unlike constant volume systems, these dampers modulate airflow while maintaining a constant supply temperature, optimizing energy efficiency and comfort across varying shipboard environmental conditions.

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