What is the purpose of a manometer in HVAC systems?

A manometer serves a crucial role in HVAC systems by measuring air pressure differences. This device is specifically designed to provide precise readings of static and dynamic pressure within ducts or other components of an HVAC system. By measuring these pressure differences, technicians can assess how effectively air is moving through the system, which is vital for ensuring efficient operation and maintaining comfort levels in a building.

Understanding the pressure dynamics helps in diagnosing issues such as leaks, blockages, or imbalances within the ductwork. This can lead to better airflow management and system performance, ultimately contributing to energy efficiency and comfort.

In contrast, the other choices focus on different measurements not associated with a manometer. While measuring air duct velocity is important, it typically requires different instruments such as an anemometer. Electrical current measurement involves multimeters or clamp meters, and humidity levels are gauged using hygrometers. Each of these functions is meaningful within the HVAC domain but is not the specific purpose of a manometer.