"Tiny Cooling Fan" impeller balancing done: Just as car wheel balancing to do the same, wind turbine wind-screen machines also need to do this job, simply put, is to maintain a balance in the operating state of the wind turbine, and reduce noise, and extend the life of the fan. Balance is a time consuming job, in fact, the final result may be in some part of the "Tiny Cooling Fan" wind turbine plus counterweight piece only. But where is the position plus? Plus how much? This directly affects the life of tubular wind screen machines. Cross flow fan is to use a relatively long barrel-shaped impeller fan work, the barrel-shaped "Tiny Cooling Fan" diameter blades are large, because large diameter in order to ensure the basis of the overall amount of air circulation on the use of comparative low speed, thus, reducing the noise caused due to high speed operation;