After the heat of the fight, a lot of "220V AC Cooling Fan" have emerged aging. To avoid noise, replace the fan is imperative. But not all fans are part of the standard specification, a lot of CPU and graphics card fans are nonstandard "220V AC Cooling Fan", to replace the cooling fan of these products would cost extra effort. Currently, the use of screw column + CPU heat sink back plate clip has been more and more programs. So when replacing the CPU "220V AC Cooling Fan", and there is not much difficulty. But note that, in order to represent the brand Cooler Master, four screws at the bottom of the column will usually have a little snap. If not removed, the four screws column can not be removed, CPU fan will not be replaced.