Voltage fluctuation "Tiny Cooling Fan" will affect the noise level. The higher the voltage applied to the fan, because the speed increases, the greater the vibration, noise generated is also greater. Consider "Tiny Cooling Fan" design: Each fan constitute part design, will affect the noise level. Consider the following design can achieve lower noise: the winding core size, "Tiny Cooling Fan" fan and frame design and manufacture of precision and balance. Air flow, air flow path in its internal parts of the system will encounter obstruction, the impedance will restrict the free flow of air. Change in pressure, i.e. the measured static pressure, expressed in inches of water column.