Spinning of air at inlet connection
 
Ensure spinning of air at fan inlet does not take place
 
Don't
Don't
A poorly designed inlet box can generate spinning of the air which can reduce performance by around 25%.
Also, avoid small inlet boxes as they can cause surging.
 
Do
Image
Splitters at the inlet help prevent spinning flow.  Turning vanes, where R/W<1.0 improves uniformity of flow approaching the fan inlet.
Inlet boxes should be amply sized.
 

 

Propriety information courtesy of FANTECH (Australia)

 

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