AC fan uses alternative current to power the fan, whereas DC fan uses direct current. AC powered fan is usually used on home appliance, big size, high speed fans. DC powered fan is usually used on PC industry, and its fan speed can be adjusted by changing the supplied voltage.

The conventional case fan working ambient is around -10~60℃. Some of ENERMAX fan has upgraded componments and can extend the working ambient to 85℃ such as Magma or TwisterPressure series.

ENERMAX's patented Twister bearing has self-lubricated composite, therefore, it has no lubricant drained or deteriorated risk. The built-in magnet stablizs the fan shaft and keeps the vibration/friction away. Therefore the Twister bearing has quieter performance than sleeve bearing, and longer MTBF than two-ball bearing. Furthermore, the Twister bearing allows the fan be detached/re-attached for easy dust cleaning.

CFM = cube feet per minute;  m3/h= cube meter per hour;  m3/h = CFM x 1.699

Common DC fan can be adjusted its fan RPM by changing the supplied voltage. The PWM (Pulse-Width-Modulation) fan uses additional signal to receive the PWM (from MB or other console) to adjust its RPM.

The fan has built-in thermal sensor to read the ambient/attached object temperature, and the fan can be programmed to self-adjust the RPM accordingly such as ENERMAX Everest fan

APS (Adjust Peak Speed) is a built-in switch on PWM fan. It gives the fan different fan peak RPM options for users to chose. For example, ENERMAX TwisterPressure provides three speed option: 500-1200/1500/1800.

SSC (Shift Speed Control) is a built-in switch on DC fan.  It gives users the multiple choice of fan's max RPM. For example, TwisterStrom can set its max RPM of 1500/2500/3500 via SSC control.

When fan is applied with direct contact of certain airflow resistance object such as the heatsink of air cooler, or the radiatior of liquid cooler, the fan (blades) generating higher pressure can push more air to travel through, and take the heat away.