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The purpose of a duct blower is primarily to increase airflow within the duct system. Duct blowers are designed to assist in moving air through the ducts more efficiently, especially in systems that may have static pressure issues or where airflow needs improvement to ensure even distribution of conditioned air throughout a space. By boosting airflow, the blower ensures that the heating or cooling systems operate more effectively, leading to improved comfort and energy efficiency.

The increase in airflow can also help overcome resistance caused by long duct runs, bends, or partially blocked sections within the ductwork, ensuring that air reaches all areas of a space as intended. A well-functioning duct blower is essential for maintaining optimal system performance and enhancing indoor air quality by ensuring adequate ventilation.

The other options are not relevant to the primary function of a duct blower. It does not serve to cool the air directly, nor does it measure airflow speed or filter contaminants from the air. Each of these activities requires different equipment and serves different purposes within HVAC systems.