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Of a ventilation system, depends on the diameter of the pipe, on its friction coefficient and on the volume of the air (in turn, the function of the water volume) expressing: L=2,58 X 10-7 x (d5 / (f x g2) being: d diameter of the pipe, in mm f friction coefficient, dimensionless q the air volume, in dm3 /s for a pressure of 250 Pa.
