For axial cooling fans, the major source of inefficiency is located at the blade tip. This interaction between high and low pressure air causes the formation of small vortices, creating unwelcome noise and inefficiency.
By connecting the blade tips with an outer ring, like the spokes on a bike wheel, and hiding them within an inlet cone, the formation of these vortices will not stand a chance, providing a giant boost in efficiency.
This design feature also provides crucial mechanical support to the blades, making the fan assembly stiffer and less vulnerable to mechanical damage from fatigue and wind loads.
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