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28 TRG-TRC013-EN
notes
period two
Fan Types
Forward Curved (FC) Fans
The first of these centrifugal fan wheels to be considered has blades that are
curved in the direction of wheel rotation. These are called forward curved, or
FC, fans.
FC fans are operated at relatively low speeds and are used to deliver large
volumes of air against relatively low static pressures. The inherently light
construction of the forward curved fan wheel does not permit this wheel to be
operated at the speeds needed to generate high static pressures.
The curved shape of the FC blade imparts a forward motion to the air as it
leaves the blade tip. This, together with the speed of wheel rotation (S), causes
the air to leave at a relatively high velocity (V).
Forward Curved Fan
Figure 40
Forward Curved Fan
S
S
V
V
Figure 41