"220V AC Cooling Fan" Since the fins is to increase the surface area, how to maximize the surface area, that is, after the material has been decided to focus on the most important design. Common heat sink is die cast into a common shape of the blade is only a few more "leek" shape, the cooling effect of this "220V AC Cooling Fan" fins is the most common. The more high-grade aluminum heat sink is made of molded after turning lathe, shape showed a plurality of teeth after turning cylinder. "220V AC Cooling Fan" fins used in high-end graphics cards and some foreign original machine, (there are many foreign original machine simply does not use a fan, use only this heat sink) which shows the great influence the shape of the fins on the cooling effect.