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How centrifugal fans work

The centrifugal fan is essentially a variable flow constant pressure device. When the speed is constant, the pressure-flow theoretical curve of the centrifugal fan should be a straight line. Due to internal losses, the actual characteristic curve is curved. The pressure generated by a centrifugal fan is greatly affected by changes in intake air temperature or density. For a given intake air volume, the highest pressure (lowest air density) produces the lowest pressure. For a given pressure and flow rate, The characteristic curve has a power and flow characteristic curve. When the blower is running at a constant speed, for a given flow, the required power increases as the intake air temperature decreases.

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