Centrifugal fans and blowers have been part of our world since at least the 16th century, when they were used to ventilate mines. Today, they’re one of the most common types of fans used in the heating, ventilation and air conditioning, in addition to being some of the most efficient and versatile. By displacing air radially, these fans are able to change the direction of any given airflow by 90 degrees.
However, not all centrifugal fans are made the same. Each has specific applications it’s most suited to. With that in mind, here are the most essential factors your air handling manufacturer should know about:
Centrifugal fan vs axial fan: Know the difference
The first step to knowing which type of fan is best for your air ventilation equipment is knowing the best uses for centrifugal and axial fans. As stated above, centrifugal blowers and fans move air 90 degrees, while axial fans move air parallel to the shaft in which the fan is located.
Understand your velocity requirements
High pressure centrifugal blowers might sound best for your air moving equipment — but having “high pressure” in the name doesn’t necessarily make it perform better. When looking for the most appropriate blower, determine the amount of pressure required to move air through the ducts of your air ventilation system. Higher pressure blowers are best if you have a longer, more complicated duct system. Filters or dampers will also have an impact on the level of pressure and power needed from your centrifugal blower, so keep this in mind as well.
Factor in environmental and air quality needs
Will your fan be located outdoors or in a dirty, corrosive environment? This is a factor that should play a role in your choice of motor blower. For example, Totally Enclosed Fan Cooled (TEFC) motors work well in outdoor environments, while non-sparking blowers should be used in environments where hazardous chemicals are present. Also consider the air quality in which your fan will blow. Radial, high-pressure blowers are best if the air is lightly dusty, for example, but heavier dust in the air will require an industrial material handling blower.
Understanding the differences between centrifugal air blowers is a crucial skill for anyone at an air handling manufacturer or distributor to know.