指出了全空气空调系统噪声控制应注意的几个问题，如消声器设置、空调机房及风管传声、噪声叠加等。

Points out the key issues in noise control including the arrangement of sound absorber, noise transmission from machine room and duct and noise superposition.

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水比空气能更好的传声。

Water transmits sound better than air.

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实验结果表明，风机管道中空气流动对传声器测量信号的影响很大。

The experimental result shows that the measurements with microphone are highly sensitive to airflow in the fan duct.

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