To focus on "Micro Cooling Fan" in size, the general principle is capable of big not small. Today most of the chassis is chassis fan support multiple standards, compared to common support 12cm, 8cm of fans. In this case, it advocates a larger diameter fan means. Due to the large "Micro Cooling Fan" fan only needs low speed, it is possible to achieve aspirations of the air volume. The most significant advantage is the low speed caused by noise. The smaller diameter fans, mostly through the high speed to achieve better cooling effect, noise is larger than the diameter of the "Micro Cooling Fan" high. Thus, we advocate in the purchase of the chassis fan, Priority Consideration of 12cm diameter fan. Diameter size will be indicated on the product packaging, a good identification.