"220V Cooling Fan" fan pressure since it is one of the two most important performance indicators, naturally pay special attention to the selection of the fan. When combined with flaky fin + duct design of heat sink, usually without too much pressure, to ensure the smooth flow of air to achieve the desired effect; if "220V Cooling Fan" with typical flaky parallel fins + top-blown heat sink design, they should according to the density and height of the fin, the fin duct between the shape and length of the selection with sufficient pressure fan; if with Alpha or Swiftech and other dense cylindrical fin + top-blown design heat sink, it is necessary "220V Cooling Fan" has a greater wind pressure. Detailed analysis of the fan and heat sink combination of structures, etc. See Part III.