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TRG-TRC013-EN 33
period two
Fan Types
notes
A variation of this type of fan, called the backward curved (BC) fan, uses a
slight curve in the fan blades, away from the direction of rotation. The
performance characteristics of the BC fan are similar to those of the BI fan.
Airfoil (AF) Fans
A refinement of the BI fan changes the shape of the blade from a flat plate to
that of an airfoil, similar to an airplane wing. The airfoil blade induces a
smooth airflow across the blade surface, reducing turbulence and noise within
the wheel. This results in increased static efficiency and reduced overall sound
levels.
Airfoil (AF) fans exhibit performance characteristics that are essentially the
same as those of the flat-bladed BI fan.
backward curved
S
S
V
V
Backward Curved Fan
backward inclined
S
S
V
V
Figure 49
Airfoil Fan
Figure 50