Pressure recovery
 
Look for opportunities for pressure recovery at centrifugal exhaust fan outlets.
 
Don't
Don't
To determine the system resistance the discharge losses have to be added before selecting the fan.
Discharge losses are highest in this arrangement and are equivalent to one velocity head.
 
Do
Do
With a correctly designed discharge diffuser the pressure recovery in the diffuser will reduce the system total pressure.
Included angle of diffuser to be 15º or less.
Discharge losses reduced by up to 75% in this arrangement.
 
Look for opportunities for static pressure recovery at axial exhaust fan outlets.
 
Don't
Don't
To determine the system resistance the discharge losses have to be added before selecting the fan.
Discharge losses are highest in this arrangement and are equivalent to one velocity head.
 
Do
Do
With a correctly designed discharge diffuser the pressure recovery in the diffuser will reduce the system total pressure.
Included angle of diffuser to be 15º or less.
Discharge losses reduced substantially in this arrangement.
 

 

Propriety information courtesy of FANTECH (Australia)

 

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