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The Fan Laws

Ventilation Guide

These laws enable you to change the aerodynamic parameters : 

  • Airflow (Q)
  • Pressure drop (rp)
  • Power absorbed by the impeller (P)
  • Sound level (Lp)

As a function of:

  • The speed (RPM) (N)
  • The impeller diameter (D)

For a given impeller diameter, changing the speed from N1 to N2


For a given speed, changing the impeller diameter from D1 to D2