Description: rated flow rate divided by the outlet area of the plant ; Name: Average nominal velocity in the outlet area of the plant
Description: Rated flow at the outlet area of the installation divided by the inlet area of the installation; Name: Mean rated velocity at outlet area of the installation
Description: ten times the logarithm to the base 10 of the ratio of the sound energy, j, to a reference value, j0, expressed in decibels; Name: sound energy level