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The centrifugal
fan is one of the most widely used fans.
Centrifugal fans are by far the most prevalent type of fan used in
the HVAC industry today. They are often
cheaper
than axial fans and simpler in construction. They are used in
transporting gas
or materials and in ventilation systems for buildings and vehicles.
They are
also well-suited for industrial processes
and air
pollution control systems.
These
fans work by increasing the pressure of an
incoming airstream by turning a series of blades (impeller) mounted on
a
circular hub. This accelerates the air as well as changes the direction
of the
air flowing outward, often by 90 degrees. In addition, these fans
produce a
steady airflow.
Below are the
six most common types of centrifugal fans,
each with a unique blade configuration.
Forward Curved
Fan – Also known as a squirrel cage fan due
to the wheel type, this fan’s impeller is forward and somewhat small.
In
addition, the blades curve in the same direction as the rotation of the
wheel.
Because the impeller, shaft, housing, and bearings are delicately made,
there
are some limitations for sustainability when used for industrial
applications.
However, this fan is great for low-speed and low-pressure applications.
Backward
Inclined Fan – There are three standard blade types
for this fan, including curved single thickness, flat single thickness,
and
curved airfoil. In addition to being relatively heavy and larger, the
blades
are designed to move away from the rotation of the wheel. For
operation, this
fan produces the highest speed. It is also considered more efficient
than other
fan types. Usually, the backward inclined fan is the best choice for
low-pressure and high-volume applications.
Radial Blade
Fan – This centrifugal fan is referred to as a
paddle wheel fan because the impeller has many equally spaced flat
blades that
extend perpendicular to the direction of rotation for the wheel.
Sometimes,
this type of fan has side rims. The blades tend to be heavier, but they
are
also narrower and deeper compared to both forward and backward inclined
blades.
Producing medium to high pressure and being able to move a higher mass
or
volume of fluid, this fan is best suited for material handling.
Airfoil Blade
Fan – The blades of this fan are hollow and
backward inclined. Therefore, the fan is ideal for handling large
volumes of
clean air while operating at static pressures that are low to moderate.
This
fan also runs at a greater speed and produces optimum efficiency
compared to
the backward inclined fan. Capable of handling large volumes of air, it
is used
in induced and forced draft fans required for a wide range of
applications.
Radial Tip Fan
– These centrifugal fans have blades with a
backward and curved configuration while cupping in the direction of
rotation
for the wheel. Although compact, the fan works great for applications
of
high-volume airflow in which the requirement for pressure is
considerably high.
Inline Fan –
Inline centrifugal fans are rugged. In
addition, the backward inclined wheels are actually enclosed in a
tube-axial
casing. This medium-duty fan is less efficient and, therefore, used
primarily
when low-pressure airflow is required.
CANADIAN
BLOWER's engineers would be happy to discuss any
fan application with you, provide technical support and competitive
fans and
blowers quotations.
