Air volume and air pressure
wind pressure and wind too are two relative concepts, to design the fan air volume is big, have to sacrifice some wind pressure, if the fan can bring a lot of air flow, but the wind pressure is small, the wind is less than the bottom of the radiator ( That is why some fan is high, volume is very big, but is the reason why cooling effect is not good) , on the contrary wind pressure is often means that the air volume is big, there is not enough air and heat sink for exchange, also causes the cooling effect is not good. The morning a cooling fan air volume, low noise, long service life.