Gas Heat ESCO Practice Exam

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What instrument would a technician use to measure return airflow to a furnace?

Anemometer
Hydrometer
Micrometer
Thermometer

The correct answer is: Anemometer

To properly measure return airflow to a furnace, a technician would use an anemometer. An anemometer is a device specifically designed to measure air velocity and flow, making it the ideal instrument for this task. It uses a small fan to measure the speed and direction of the air being moved, providing accurate readings. The other options, such as a hydrometer, micrometer, and thermometer, are not suitable for measuring airflow as they are designed for measuring other types of data, such as humidity, distance, and temperature, respectively. Therefore, A is the most appropriate instrument for this task.