Silent Case Fan:The impeller was designed with a focus on minimzing the noise level (21.5 dBA) yet delivering the superior airflow (30.5 CFM) and pressure (0.65 mmH2O) Highly Efficient Ventilation : The destinctive design on the back end of the fan blades providing highly efficient ventilation (1000 RPM)
https://www.amazon.com/Antec-F12-Performance-Noise-Value/dp/B07PFBPHL6