The fan-noise is classified according to the noisy source, some of the schemes of noise integration control and reduction are puts forward in this paper.

阐述了局部通风机噪声的分类，产生这些噪声的原因，以及综合控制、减小这些噪声的方法。

youdao

The MicroNet is fast, but installing the bulky unit was a chore, and its cooling fan is noisy.

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The bulk of the case is cast from a single piece of aluminum, and those fins, which have enough room between them for air to circulate, dissipate heat so that a noisy fan isn't required.

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Modem and network interface are included, too, along with a really noisy cooling fan.

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