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24 TRG-TRC013-EN
notes
period one
Fan Performance
The fan performance curves discussed so far are typical of both the centrifugal
and fixed-pitch vaneaxial fans. To complete the discussion, the fan performance
curves of the variable-pitch vaneaxial (VPVA) fan will be reviewed.
While this type of fan operates at a constant speed, the pitch (angle) of its
blades can be adjusted to match the airflow and pressure requirements of the
system.
Variable-Pitch Vaneaxial Fan
variable-pitch
variable-pitch
blades
blades
Figure 35