Axial fans

AC axialK seriesAC axialS seriesAC axial fansGeneralinformationCurvesAdding multiple noise sources with the same levelAdding 2 noise sources with the same volume results in a level increaseof approx. 3 dB. The noise characteristics of multiple identical fans canbe determined in advance based on the noise values specified in the datasheet. This is shown in the diagram opposite.Example: 8 A3G800 axial fans are on a condenser. According to the datasheet, the sound pressure level of a fan is approximately 75 dB(A).The level increase measured from the diagram is 9 dB. Thus the overallsound level of the installation can be expected to be 84 dB(A).Increase in sound pressure / sound power level [dB]05 9 1015125 810 15 20 25AC axialA seriesEC axial fansEC axialS seriesNumber of sources of sound with identical levelAdding two noise sources with different levels[dB]3The acoustic performance of two different fans can be predeterminedbased on the sound levels given in the data sheet. This is shown in thediagram opposite.Example: There is an axial fan A3G800 with a sound pressure level of75 dB(A) at the operating point and an axial fan A3G710 with 71 dB(A) ina ventilation unit. The level difference is 4 dB. The level increase can nowbe read in the diagram as approx. 1.5 dB. This means that the overallsound level of the unit can be expected to be 76.5 dB(A).Inverse square lawsThe sound level is independent of the distance from the noise source.Conversely, the sound pressure level decreases as distance from thenoise source increases. The diagram to the right shows the level decreaseexpressed in terms of an output measurement at a distance of 1 m fromthe noise source under far-field conditions.Example: An axial fan A3G800 has a sound pressure level of 75 db(A) atthe operating point. Now, you want to measure the noise characteristics ata distance of 20 m. In the diagram to the right, you can now read areduction of 26 dB for the 20 m distance.Decrease in sound pressure level[dB] Increase in sound pressure / sound power level01 1,5 20 4 8 12 16 20 24Difference in level with two sources of sound[dB]-40-30 -26 -20-100Q-motorESMEC-SYSTEMSAccessoriesTechnology1 2 5 10 20 50 100Distance[m]395Contacts