"Axial Flow Fan" general installation height is higher, but also more difficult to replace, so to choose the type of direct suction fan in the fan directly where there are a variety of products, the most important thing is to look at the motor and fan, and some manufacturers in order to save costs, instead of using a small motor and blowing is imported from Japan and Taiwan over this small "Axial Flow Fan" in the first two years of repairing motor used is not very high, as long as there is a slight imbalance fan , two rear motor failure rate will be high. So for the purchase "Axial Flow Fan" Do not blindly buy, must be cautious, do not blindly just because they are cheap, the saying goes, no sub cheap goods.