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Ventilation Guide

The Fan Laws

These laws enable you to change the aerodynamic parameters :

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

Choice of Fan

The fan selection must take into account some parameters such as:
Type of premises:


Airflow Rate

This is the air volume required to extract or supply air into a room during a given time.
Several methods can be used to calculate the air flow:
After calculating the volume of the room, multiply volume by the number of Air Changes per Hour ( ACH ) :
This calculates the air flow required in meters cubed/hr