"24V DC Cooling Fan" of air pressure and air volume has been relatively easy to confuse the concept of many players, simply, it is the pressure of the wind pressure, the greater the pressure, the greater the force of the wind, the more likely the chassis punch hole blown through the air filter and other components. The air flow can be understood as the same time the gas flow through the fan size, at the same time, you can exchange more airflow to enhance heat dissipation.