Performance – Max & Speed Percentage
Max RPM, CFM, Pressure & Power
Because of the relatively low max speed, max airflow and static pressure are not that high. Nonetheless, keep in mind that most of the time, high-speed fans do not operate at their maximum speed! What we care about is the performance in normalized noise tests.
20 – 100% Fan Speed Percentage
Since most fan control ICs don’t apply precisely the percentage of RPM speed that you want (e.g., 50% PWM for a 2000 RPM fan should be 1000 RPM), I used to find the fan’s maximum speed and then dial directly the fan speeds that corresponded to 10%, 20%, and so on of its maximum rated speed. I decided to stop doing that. So from now on, in all of my fan evaluations, I will dial the corresponding PWM value in 10% steps to also check how accurate its fan controller is and for my noise results to align with the airflow and static pressure results from the Longwin apparatus where I don’t use RPM but PWM control for all testing.
