Two "Tiny Cooling Fan" series static pressure generated at zero up to twice the amount of wind conditions, but in the case of free space, and can not increase the amount of wind. A series fans to pay more, at higher static pressure of the system, increase the amount of wind. Parallel operation is in parallel using two or more fans. Two "Tiny Cooling Fan" air flow volume produced in parallel, only in the free space conditions, a single fan air volume twice, and when the fan is applied to the case of parallel high system impedance, system impedance is higher, parallel fan the lower the air volume can increase. Therefore, the application is only recommended for use in parallel at low system impedance, namely "Tiny Cooling Fan" operate almost entirely in the case of air of freedom. Therefore, a series of high system impedance operational system can achieve the best results.