Noise Control in Ventilating Systems

In any acoustically sensitive room, interfering sounds can come from other rooms inside the building or from sources outside the building. Some rooms have their own internal noise problems, such as noise generated by equipment cooling fans, hard-disk drives, and so on. But there is one source of noise that is common to almost all acoustically sensitive rooms, and that is the noise coming from the HVAC (heating, ventilating, and air-conditioning) system. This includes the HVAC system’s motors and fans, ducts, diffusers, and grilles. The minimization of these noises is the subject of this chapter. ...

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