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Fan power consumption E331
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µ Fan effectiveness (performance)       Performance fans μ  
N CV power absorbed by the fan   20.jpg   small centrifugal 0,3 0,5  
Q Air flow m3/h           average centrifugal 0,5 0,7  
q Air flow m3/s           large centrifugal 0,7 0,9  
h Prevalence mm c.d.a.         helical 0,4 0,6  
  Power Consumption CV   19.jpg      XXX changeable values   
N = Q x h  / 75 x µ 
example
initial data   final data  
µ performance   FAN   MOTOR ACTUATING  
Q m3/h   N CV   CV  
h mm c.d.a.   N kw   kw