How is airflow typically measured in duct systems?

Airflow in duct systems is typically measured using an anemometer. This device is specifically designed to measure the velocity of air moving through the ducts. An anemometer can provide readings in various units, such as feet per minute or meters per second, and helps in evaluating how effectively the air is being transported within the system. This measurement is crucial for ensuring that heating, ventilation, and air conditioning (HVAC) systems are operating efficiently and delivering the right amount of air to maintain comfort and air quality.

In contrast, while a manometer is used to measure pressure differences, which can be related to airflow indirectly, it does not directly measure the airflow itself. A barometer measures atmospheric pressure, which is not applicable in the context of duct airflow measurement. A voltmeter, on the other hand, measures electrical potential difference and is not relevant to airflow measurement in duct systems.

Thus, an anemometer is the appropriate tool for directly assessing airflow in ducts, making it the best choice among the options provided.