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
Problem
Propeller fans have very low static pressure available to them.
Solution
Vibro-Acoustics design takes the applied pressure drop into account to design silencers that have an acceptable pressure drop.
Centrifugal Fans
Problem
Centrifugal fans have an uneven flow profile which may cause excessive pressure drop if the silencer flow paths are not designed accordingly.
Solution
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.
Problem
Centrifugal fans have the tendency to emit tonal sounds, which are irritating to the listener.
Solution
Silencers can be tuned to attenuate sounds in specific frequency bands to counted tonal sounds.
Problem
Centrifugal fans have relatively higher radiated noise levels, which might need to be addressed.
Solution
Enclosures can be designed around centrifugal fans to attenuate radiated noise.