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36 TRG-TRC013-EN
notes
period two
Fan Types
The application range of the vaneaxial fan is from approximately 60 to
90 percent wide-open airflow. Similar to the BI and AF fans, the input power
lines are essentially parallel to the fan performance curves, and therefore the
vaneaxial fan is considered a nonoverloading type of fan.
Static efficiencies from 70 to 80 percent can be achieved with vaneaxial fans.
The airflow and static-pressure performance range is similar to that of the BI
and AF fans.
Compared to centrifugal fans, vaneaxial fans typically have lower low-
frequency sound levels and higher high-frequency sound levels, making them
an attractive alternative for sound-sensitive applications.
The variable-pitch vaneaxial (VPVA) fan is similar in construction to the
fixed-pitch vaneaxial fan. The principal difference is that the VPVA fan is a
constant-speed fan with variable-pitch fan blades.
60%
60%
90%
90%
airflow
airflow
static pressure
static pressure
Vaneaxial Fan
application
application
range
range
static efficiency
static efficiency
70 to 80%
70 to 80%
Figure 54
Variable-Pitch Vaneaxial Fan
variable-pitch
variable-pitch
blades
blades
Figure 55