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Performance characteristics of centrifugal fan Oct 31, 2017 Centrifugal fan is a variable flow constant pressure device. When the speed is fixed, the pressure-flow theory curve of the centrifugal fan should be a straight line. Due to internal loss, the actual characteristic curve is curved. The pressure generated by the centrifugal fan is influenced by the change of inlet temperature or density. For a given inlet, the maximum inlet temperature (lowest air density) produces the lowest pressure. For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the blower is running at constant speed, the required power increases with the inlet temperature decreasing for a given flow rate.