To maintain good indoor air quality, what should return air ducts do?

Ensuring optimal air circulation is essential for maintaining good indoor air quality. Return air ducts are responsible for transporting air from the living spaces back to the HVAC system. If the air circulation is optimal, it allows for a continuous exchange of indoor air, which helps to dilute and remove contaminants such as dust, allergens, and volatile organic compounds (VOCs) that can accumulate indoors.

When return air ducts function effectively by promoting good circulation, they help the HVAC system maintain balanced air pressure and temperature, leading to a more comfortable and healthier indoor environment. This airflow plays a vital role in filtering and refreshing the air, facilitating proper ventilation throughout the space.

The other options may contribute to other aspects of HVAC performance but do not directly address the primary role of return air ducts in maintaining indoor air quality through optimal circulation.