General construction

The main elements of a true mixed flow fan are seen by refer­ence to Figures 1.97 and 1.98, similar to a vee belt driven vane axial or in-line radial. The major difference is in the impeller, which is generally of fabricated construction. Both the front shroud and backplate are at an angle, so that the air follows a

Path somewhere between axial and centrifugal flow. It will be noted that the casing is just slightly larger than the impeller out­side diameter.

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