The wide body, low-pitch blades of the SP120 fans combined with the custom housing provides outstanding static pressure & airflow through heat sinks or radiators. With rubberized corners, a quiet & reliable advanced hydraulic bearing, & PWM support for increased fan speed control, the SP120 truly is the strong, silent type. The SP120 Quiet Edition, at full RPM, is an extremely quiet 23 d BA while maintaining an impressive 1.29 mm/H2O static pressure level.