"24V DC Cooling Fan" casting (Casting) fin pressurized molten metal into the mold in order to produce precisely dimensioned devices. This technique produces high-density acicular fins. The high cost of governance is the biggest investment costs, but the low cost of the device suitable for mass production can make up for this part. Thermal conductivity casting fins will be reduced during curing to produce a porous gas permeation. "24V DC Cooling Fan" Then (Bonding) heat sink fins will then assemble at the bottom of the heat sink fins, and then a big impact on the efficiency of the heat sink agent, if manufactured properly, will hinder the formation of thermal, thermal plastic or general use is solder. Then at the bottom of the heat sink because it needs special processing, thus making the cost is higher, but due to upgrade manufacturing technology, and improved adhesive, such as thermal conductivity of aluminum filled with glue, etc., and then reduce the cost of making the fins. Such "24V DC Cooling Fan" process mode can manufacture high aspect ratio fins, without increasing the volume of lower demand can be a substantial increase in the cooling efficiency.