Owl and fan: ebm-papst’s position

Statement from ebm-papst

In response to recent information about the alleged influence of the shape of a fan blade’s trailing edge on the noise level it emits, we explain:

Precise studies in modern laboratories clearly visualise the sources of disturbances in airflow (turbulence) and, consequently, noise in all kinds of equipment. For axial fans, the following elements are ‘critical’: - the leading edge, - the end of the fan blade.

As clearly shown in the presentation above, the trailing edge has no effect whatsoever on the fan blade’s noise emission level. Any structural changes are purely a ‘cosmetic’ and marketing exercise. The ebmpapst group has been applying these facts in its products for many years, enabling us to design and manufacture fans widely regarded as the quietest and most energy-efficient (EC technology) in the world, without having to use ‘cheap marketing gimmicks’ to promote them. For more detailed information and comparisons, please contact our company representatives. www.ebm

papst

.pl

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Source: submitted. Photo: internet.