Designations for axial and mixed flow fans
This is not normally of any great concern for the fan user except when obtaining spare parts. Sometimes, however, it may affect the magnitude of system effect factors. The manufacturer may need a code for determining the handing of impeller parts.
ISO 13349 specified that the rotation is determined from the side opposite the inlet, (see Figure 9.8).
Figure 9.8 Direction of rotation of axial and mixed flow fans
LG: anticlockwise rotation RD: clockwise rotation
Figure 9.9 Designation of motor position for axial and mixed flow fans
These also have been standardised in ISO 13349 and 99-2404 of 1998. The similarity with the corresponding centrifugal fans will be recognised.
Adescription of the driving arrangements is given in Table 9.3. It will be noted that not all arrangements available for centrifugal fans are applicable to axial and mixed flow fans.
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