. 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. With 4 LEDs attached to the. PH-F140SP_BK_LED. these fans will make any case more aesthetically appealing. The. ON/OFF switch. allows user to enable or disable the LEDs..