• Pulsation within the piping system

• Noise radiation in the vicinity of the blower and piping

The importance of these relative to each other is a function of blower size and speed; both increase approximately proportionately to the size and as the square of the speed.

Pulsation is more pronounced on the discharge side of the blower. Peak pulse pressures are quite severe and can result in unsilenced discharge sound power levels up to 140-145 dB. The inlet produces less severe pulsation and noise but often needs attenuation comparable to that at the discharge.

There is little question that silencers are necessary on any blower installation. Regardless of the size or speed of the blower, there is a need for both inlet and discharge silencers. While the discharge silencers are shown in the pictures, similar designs are also available for the inlet of the blower. In the selection of silencers, there are two basic considerations:

• The silencer must be the correct size, that is, have sufficient capacity for the volume flow

• The silencer must be the proper type for the given application

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