Measuring airflow at the fan inlet presents challenges from a measurement technology standpoint. Achieving accurate flow measurement at the fan inlet, without affecting fan performance, is an important consideration when selecting the correct airflow station. The large variation in airflow velocity as well as the multiple fan configurations that exist within a given AHU must be taken into consideration. Measuring airflow at the fan inlet can be advantageous from an accessibility standpoint as well as monitoring the performance of each individual fan in the fan wall or fan array at the source.
The products below are commonly used for this application.