After the "Tiny Cooling Fan" amount of wind pressure is the major determinant & thermal performance, often fan shape specifications laid down, focus on the characteristics of the fan air flow & pressure requirement is by no means the fan speed, usually people will misunderstand this emphasis start using a manufacturer of fan speed to 2400RPM, as long as B is also 2400RPM fan manufacturers will be able to do so completely wrong. A manufacturer such as 4028 "Tiny Cooling Fan" speed of 8000RPM, air volume 30CFM, pressure for 15mmHO2, rated current of 0.16A, the noise is 30dB; 4028 manufacturers that B fan speed is 7500RPM air volume 32CFM, pressure for 15.6mmHO2 rated current of 0.14A, the noise is 30dB; from the numerical point of view, B is better than a manufacturer's parameters manufacturers and manufacturers of 7500RPM B's "Tiny Cooling Fan" a manufacturer can 8000RPM fan with alternative (other quality agreed under the former title), so we choose not to see the specifications of the fan speed, but look at the amount of wind & pressure