Never before has the need for adequate workspace ventilation been clearer to safety experts. Factories, warehouses, mines, offices and all other places where workers spend their time must be adequately ventilated and heated or cooled in order to minimize risks to air quality and maximize comfortable conditions, which contribute to productivity.
Axial fans and centrifugal blowers, in high velocity and other configurations, are used to move air through ventilation systems and remove air through exhaust ports. The agricultural, photography, automotive, food processing, packaging, paper making, printing, welding and textile industries all use industrial blowers for workspace ventilation and a host of other applications, some of which are moisture reduction in bathrooms, spas and gyms and cutting down on smoke and odors in cooking and food processing.
Centrifugal floor dryers are widely used to dry carpet after cleaning. They are also used in building maintenance applications to dry spills or clean up after water damage.
An industrial blower can be designed in one of two configurations. Axial blowers, which are more easily recognizable to most people, feature curved blades that spin around an axis. The spinning motion of axial fan blades closely resembles the motion of the spinning hands on a clock. The curvature of the blades creates an imbalance of air pressure on either side of the fan. The difference in air pressure causes airflow. When the blades spin continuously, the airflow is continuous.
The same principle of pressure imbalance applies to the other fan configuration as well. Radial (or centrifugal) fans also feature spinning blades, but radial fan blades spin within the confines of an enclosure (which is called an annular housing), and their spinning motion more resembles that of waterwheel paddles than of clock hands. As the blades (which are called impellers) within a centrifugal fan spin, they draw air from the side of the fan into the enclosure.
The impellers create a quick airflow. That quickness is augmented by the effect of centrifugal motion because of the shape of the annular housing. The result is that a centrifugal fan can produce a higher-pressure flow of air than can an axial fan operating at the same RPM. This feature makes centrifugal fans more attractive than axial fans in many industrial applications.