# Record the fan duty point before asking for a quote

Give the supplier the airflow needed through the assembled enclosure and the pressure the fan has to overcome at that airflow. Put both figures on the same line. If you only know one, mark the other as an estimate or ask how to measure it.

Ask for the curve for the exact model and speed. A maximum airflow figure measured in free air and a maximum pressure figure measured at zero flow describe different points. Compare the pressure the fan can deliver at your required airflow.

Keep the operating point, supply and frame dimensions together in the request. The Hongbo Motor industrial fan catalog is a supplier reference for comparing axial and centrifugal models before you request model curves.

This procurement resource was prepared for Hongbo Motor.