According to the principle of fan aerodynamics, increasing the diameter has a significant effect on the volume of air that can be moved. Larger diameter = more air 
flow with relatively smaller motor torque compared to increasing the rotation speed. This means, a 680mm fan can effectively cool with more efficient energy. 
A fan with a large diameter can create a stable and wide air flow—essential to cool the radiator of a large machine like in Scania. A similar concept is seen in large 
industrial fans (HVLS): capable of producing a wider air column and effectively reaching the hot surface further, For example, the Ø680mm fan blade for series 4 (OE code 1354981) 
has 10 blades and weighs only 4700 grams. Another version with 8 propellers is only around 3800grams. This shows a strong yet light design, ideal for supporting performance and durability.

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