Fans (or blowers) of large volumes for industrial applications are usually applied to air service, and essentially all manufacturers’ performance data/charts/tables are referenced to standard air; however, they can be readily adapted to chemical/petrochemical process applications in which relatively large volumes of clean gas mixtures are processed at low pressures [107].
Fans are rather generally identified as machines with relatively low pressure rises that move gases or vapors by means of rotating blades or impellers, and which change the rotating mechanical energy into pressure or work on the gas or vapor (Figures 14-139A–E). The result of this work on the fluid will be in the form of pressure energy or velocity energy or some combination ...

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