Which statement describes the function of dampers in HVAC systems?

Which statement describes the function of dampers in HVAC systems?

• A. They are part of the filter
• B. They are used only in cooling mode
• C. They are valves or plates that regulate the flow of air inside a duct
• D. They seal the duct to prevent leaks

Answer: (C)

Dampers are devices placed in ductwork that regulate how much air moves through different sections of the system. They’re essentially blades or plates that open, close, or partially obstruct a duct, and they can be adjusted manually or by an actuator controlled by a thermostat or building management system. This ability to change the cross-sectional area of the duct lets you balance airflow, direct more air to occupied or critical zones, and control overall system pressure and comfort. Dampers are about controlling air flow, not filtering it, not sealing ducts, and not limited to cooling mode, so they play a role in heating, cooling, and ventilation alike.

Dampers are devices placed in ductwork that regulate how much air moves through different sections of the system. They’re essentially blades or plates that open, close, or partially obstruct a duct, and they can be adjusted manually or by an actuator controlled by a thermostat or building management system. This ability to change the cross-sectional area of the duct lets you balance airflow, direct more air to occupied or critical zones, and control overall system pressure and comfort. Dampers are about controlling air flow, not filtering it, not sealing ducts, and not limited to cooling mode, so they play a role in heating, cooling, and ventilation alike.