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TRG-TRC013-EN 61
period five
Review
notes
Period Two introduced the various fan types, including forward curved (FC),
backward inclined (BI), airfoil (AF), and vaneaxial.
Period Three presented various methods for controlling fan capacity, including
“riding the fan curve,” discharge dampers, inlet vanes, variable fan-speed
control, and variable-pitch blade control.
Review—Period Two
centrifugal
axial
Figure 87
Review—Period Three
▲ “Riding the fan curve”
▲ Discharge dampers
▲ Inlet vanes
▲ Fan-speed control
▲ Variable-pitch blade control
Figure 88