If you want to determine the fan performance is good or bad, just by looking at the amount of wind and air pressure can judge them, but the centrifugal fan air volume and pressure we rely on to know? This see and touch the things you want to get a specific value, then use some special equipment, but many times do not have these conditions, how to deal with it? We also have the means. We must first look at the concept of air volume and pressure, the air volume actually refers to the speed of the fan-ventilated area with the plane of the plot. The ventilation area is subtracted from the value of the projected area of ??the outlet area of ??the tongue at the vortex obtained, the plane is the velocity of the air flow rate through time. When the plane speed is constant, the larger the ventilation area, that is, the larger the outer diameter of the impeller blades, the greater the amount of wind. The larger the amount of wind, the air, the greater heat absorption, thermal effect is more obvious fan. The air pressure is to be able to normal ventilation, equipment needed to overcome the resistance, we change the value of the measured pressure will generally referred to as static pressure, which is parallel to the surface pressure of the gas on the role of the object, is the use of perpendicular to its surface of the hole measured. In practice, that is not to say that strong ventilation air volume capacity. Also take into account is the main air flow, air flow path in its encounter obstacles, so when the wind increases, pressure decreases. Sometimes in order to reduce the system impedance, even the choice of a smaller size fan, also can obtain the same amount of wind. 

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