"Micro Cooling Fan" Tip Gap: How to adjust the gap that exists between the fan and the fan frame design is a major problem. Gap is too small will make here airflow and the blade, the frame friction, increased noise; increase the gap is due to the influence of air currents ear flyback reduce fan efficiency - the gap increases 1%, the total pressure drop of about 2% power .
"Micro Cooling Fan" blade Arc: In addition to having a curvature blades in cross section, but in the top plan also extends along the radial direction is not straight, but curved slightly toward the direction of rotation, was a certain arc. If the blade straight radially extending driven by rotation of the fan at the outlet side of the gas flow will show a widely scattered, air distance is short, and "power" is not centralized; such as the current product version slightly curved, can guarantee the blown air current focus within the columnar space in front of the outlet, increase air distance and pressure.
"Micro Cooling Fan" spindle diameter: Because of the motor and bearings, the central portion of the spindle where the axial fan inevitably some air flow through the blind spot, the spindle diameter will determine the size of this gray zone. The size of the diameter of the main shaft of the fan motor depending on the power - the power of the motor stator windings require larger, must take up more space, without being able to scale up (increasing the height), they would have to scale ( increasing the area).