"220V Cooling Fan" This thing speaking nothing high-tech, but to do it not only wind, noise and other performance indicators mixed, there are a world of difference on the price, a few dollars, a lot of ball fan, a few hundred pieces also many high-end fan. Massive fan Hengping time-consuming, because "220V Cooling Fan" cooling effect depends on various factors room, radiator, CPU heat, etc., and there is no uniform measurement standards such 3DMark, but not when you have a website to do a do so Hengping, they tested a total of 60 models "220V Cooling Fan", mostly 12cm and 14cm standard, substantially completely covering the fan makes and models on the market.