Like many other types of rotating machines, generator sets powered by internal combustion engines emit noise and vibrations. Whether these generator sets operate continuously as in the case of mains power sources or only operate occasionally, in many cases operating noise must still be reduced to meet local and state regulations. or federal. In North America, the maximum allowable general noise level ranges from 45 dB(A) to 72 dB(A), depending on the locality or region. In fact, recently, some states and communities have begun to introduce noise restrictions at property boundaries using octave band frequencies to reduce low-frequency noise. spread to neighboring areas in the community. Noise levels from untreated generator sets can reach 100 dB(A) or higher, so the location of the generator set as well as noise mitigation are both very important.