Select "AC Fan", always will falter in the face of numerous types, this is because there is no fan of several common types of detailed comparison and understanding the user selects before, was a result of difficult choices, Among the many types of fans, axial fans and centrifugal fans are the most common type, which we are most likely to be chosen, how can it distinguish between the two types of fans it? Proof fans will be able to a good foundation, combined with the effect of the use of the fan itself, so that the environmental quality of the best places in the state for personal health and safety of the goods can play a very good protection.