A HVAC flow meter is a device used to measure the flow rate of air or other gases in a heating, ventilation, and air conditioning (HVAC) system. It is used to monitor the performance of the system and ensure that it is operating at its optimal level. The flow meter is typically installed in the ductwork of the HVAC system and measures the rate of air flow through the system. This helps to ensure that the system is not operating at too high or too low of a rate, which can cause the system to become inefficient and costly to operate. Additionally, the flow meter can be used to detect any blockages or leaks in the system, which can lead to further inefficiencies. By using a HVAC flow meter, HVAC technicians can ensure that the system is operating at its peak performance and is providing the best possible air quality for the occupants of the building.