Vane anemometers are handheld instruments used to measure air velocity or air flow in a wide range of applications, including HVAC (heating, ventilation, and air conditioning) systems, industrial ventilation, and building performance testing.

The basic design of a vane anemometer consists of a set of rotating vanes that are placed perpendicular to the air flow being measured. The vanes are connected to a sensor that measures the rotational speed of the vanes, which is proportional to the air velocity or air flow. Some models of vane anemometers also include a digital display that shows the measured values in real time.

Vane anemometers are versatile instruments that can be used to measure air velocity or air flow in both ducts and open spaces. They are often preferred over other types of anemometers, such as hot-wire anemometers, because they are less sensitive to variations in temperature and humidity.

Vane anemometers are commonly used to measure the air velocity or air flow in HVAC systems to ensure that they are operating efficiently and effectively. They can also be used to measure the air velocity or air flow in industrial ventilation systems to ensure that workers are not exposed to harmful airborne contaminants. Additionally, vane anemometers are used in building performance testing to evaluate the effectiveness of building envelope and ventilation systems.

Vane anemometers are a valuable tool for measuring air velocity and air flow in a wide range of applications, and are widely used in HVAC, industrial ventilation, and building performance testing.