. The new redeveloped blades in. PH-F140SP. are angled lower to achieve higher air pressure. The redesigned MVB blades generate better airflow & produces better performance. It improves the balance of airflow & air pressure when using with as a case fan. The. PH-F140SP. has a larger base size with a magnetic brushless DC motor to avoid the effects of resonance & for rotational stability. To create better structural strength & reduce the vibration occurrence Phanteks redesigned the back frame of the. PH-F140SP.. With the noise reduction challenges in mind we modified the component for lower actuator noise. PCBA for lower electromagnetic noise. brushless motor structure for lower operating noise & frame rib for lower wind & vibration noise..