Eccentric inlet flow
 
Do ensure inlet air to the fan is evenly distributed.
 
Don't
Don't
Eccentric air distribution at fan inlet diminishes fan performance by up to 45% because the main flow is accelerated through an effectively smaller duct area on one side while turbulence and high intensity pressure fluctuations occur on the other.  Noise level is also increased.
 
Do
Do
Rated fan performance is only achieved when air flows evenly into the fan impeller.
 

 

Propriety information courtesy of FANTECH (Australia)

 

(NOT TO BE REPRODUCED)
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