Which instrument is used to measure duct pressures?

The instrument used to measure duct pressures is a manometer. Manometers are designed specifically to measure the pressure difference between two points, which is crucial for applications in HVAC systems, including the measurement of air pressure within ducts. This capability allows technicians to assess the performance of ventilation systems, ensuring they operate efficiently and safely.

Manometers typically come in various forms, including U-tube manometers and digital manometers, and they can provide precise readings of static and dynamic pressure within ductwork. This information can help in troubleshooting problems, verifying system performance, and making adjustments as necessary to optimize airflow.

In contrast, while barometers measure atmospheric pressure and altimeters measure altitude based on changes in pressure, neither is suitable for measuring duct pressures specifically. Thermometers, on the other hand, measure temperature and do not provide information about pressure, making them irrelevant to this application. Understanding the purpose and functionality of these instruments is essential in HVAC and sheet metal applications.