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This reduces the level of noise.
Forward curved vs backward curved centrifugal fan. Another important design feature is the position of the motor. The difference is the length of impeller rail and the edge. Pressure curve less steep than that of backward curved fans. The modern forward curved blades are designed with a scroll housing.
The forward curved is parallel to the edge. Motor selection must take this into account. Power rises continually toward free delivery. The difference in flow direction between a forward and backward curved centrifugal fan is the direction that the air exits the impeller circumference.
With a backward curved impeller the air exits in a radial direction whereas with a forward curved the air exits tangentially from the circumference of the fan. Flatter pressure curve and lower efficiency than the airfoil fan backward curved fan and backward inclined fan. Backward curved centrifugal fans. On the other hand those with backward curved blades are basically free wheeling fans.
How does backward curved centrifugal fan work. In most cases these fans are designed with external motors. A backward curved centrifugal fan is characterised by its cylindrical shape several large curved blades and a conical inlet nozzle. Do not rate fan in the pressure curve dip to the left of peak pressure.
Backward inclined the performance of the backward inclined wheel is similar to the forward curve however bi fans tend to be non overloading meaning their fan curves do not tend to increase hp as static pressure changes but cfm falls off. The centrifugal fans with forward curved blades 2l 90 o are designed due to the small dimensions and good static pressure characteristics of fans and such a recommendation refers to the fans. The forward and backward curved centrifugal fan mainly refers to the different blades of their assembled. 1 forward curved blades curve in the direction of the fan wheel s rotation on the other hand backward curved blades curve against the direction of the fan wheel s rotation.
The forward curved type is generally are blowers and the backward curved type are induced draft fans. The name centrifugal fan is derived from the direction of flow and how the air exits the fan impeller radially from the outer circumference of the fan.
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