By using exhaust
fans to ventilate your building efficiently and completely, thereby
improving indoor air quality, you can avoid local ventilation
problems. Variable pitch wheels in axial fans and blowers are
used where precise control of static pressure within supply ducts is
required. The fan wheel will spin at a constant RPM . The blades follow
the control pitch hub. As the hub moves toward the rotor the blades
increase their angle of attack and an increase in flow results. Axial
flow ventilators have blades that force air to move along the shaft
about which the blades rotate. Axial fans blow air across the axis of
the fan, linearly, hence their name. This type of fan is used in a wide
variety of applications, ranging from small cooling fans for
electronics to the giant fans used in wind tunnels.
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