Performance comparison of four kinds of air duct
1、消声性能
1. Anechoic performance
镀锌薄钢板风管：无消声性能，自身震动会产生声音，必须加装消声器。
Galvanized sheet steel air duct: no noise attenuation performance, self vibration will produce sound, so muffler must be installed.
无机玻璃钢风管：无消声性能，隔
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声性能优于镀锌薄钢板风管，必须加装消声器。Inorganic glass fiber reinforced plastic duct: no noise attenuation performance, sound insulation performance is better than galvanized steel sheet duct, muffler must be installed.
复合玻纤板风管：其管壁是一种多孔性吸声材料，可省去专用消声器。
Composite fiberglass duct: its wall is a kind of porous sound-absorbing material, which can save the special muffler.
纤维织物风管：其管壁为柔性纤维织物，本身就是声音的不良导体和吸收体，自身不会产生声音，还可以一定程度上吸收设备噪声，随着管道的延长，效果更为明显，可省去专用消声器。
Fiber fabric duct: the wall of the duct is made of flexible fiber fabric, which is the poor conductor and absorber of sound. It will not produce sound, and can also absorb equipment noise to a certain extent. With the extension of the duct, the effect is more obvious, and the special muffler can be omitted.
