| The size of the air inlet aperture A in is dependent on the flow of cooling-air  d and the maximum flow speed v S in the aperture itself.
It is preferable to calculate with a flow speed of v S = 3 m/s. However, if structural considerations do not permit the size of aperture resulting from this calculation, it is also possible to use a flow speed of v S = 5 m/s.
The minimum size of the air inlet aperture is calculated with the aid of the following formula:
Ain = minimum area of outlet aperture [m³]
 d = Ventilator output [m³/h]
vS = maximum flow speed [m/s]
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