Fans move air in a variety of applications, from building pressurization to laboratory exhaust fans. It is important to consider the type of fan, since different fans have different challenges as far as noise control is concerned.
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Propeller fans have very low static pressure available to them.
Vibro-Acoustics design takes the applied pressure drop into account to design silencers that have an acceptable pressure drop.
Centrifugal fans have an uneven flow profile which may cause excessive pressure drop if the silencer flow paths are not designed accordingly.
Vibro-Acoustics designs silencers for centrifugal fans with flow shaping internals so that the flow is distributed evenly within the silencer and the pressure drop is not excessive.
Centrifugal fans have the tendency to emit tonal sounds, which are irritating to the listener.
Silencers can be tuned to attenuate sounds in specific frequency bands to counted tonal sounds.
Centrifugal fans have relatively higher radiated noise levels, which might need to be addressed.
Enclosures can be designed around centrifugal fans to attenuate radiated noise.