What role do dampers and controls play in meeting IAQ criteria?

• A. They regulate airflow to achieve the required ventilation rates and IAQ criteria.
• B. They monitor energy use of the system.
• C. They are only decorative elements.
• D. They are used to measure air quality.

Answer: (C)

Dampers and controls regulate airflow to meet IAQ criteria. They actively manage how much outdoor air is brought in and how much air is recirculated, and they coordinate with fans to deliver the right ventilation rate for the space. Dampers adjust the outdoor-air fraction and can enable economizer operation when outdoor conditions are favorable for IAQ and energy use. Controls, using readings from sensors for occupancy, CO2, temperature, and humidity, modulate dampers and fan speeds to keep indoor air within the target IAQ setpoints. This combination ensures contaminant dilution, proper ventilation rates per standards like ASHRAE 62.1, and responsive adjustments as conditions change. They are not decorative, they do not measure air quality themselves, and their primary purpose isn’t monitoring energy use, though good control can save energy while maintaining IAQ.