Customers usually buy "220V AC Cooling Fan", the general requirement is a regular first choice of the manufacturer, asking price, specifications (sizes, size of the wind, voltage and current level), or more requirements "220V AC Cooling Fan" waterproof, fire retardant and other special requirements, however, the composition of the product is not very understanding, here are a few users are more concerned about the parameters. "220V AC Cooling Fan" blades have a lot of parameters that affect performance, and mutual constraints among parameters, complex relationship. Only by constantly adjusting the parameters, find the most suitable combination of objective job requirements in order to get the best performance blades.