| 摘要 |
A sound attenuator for use in a rigid walled duct through which gas is to flow which comprises a cylindrical hollow shell within which is mounted a helical, sound absorbing, vane assembly. The interior of the wall of the shell is formed of a metallic wire screening. The shell itself is formed of a soft fiberglass mat for sound absorbing purposes. A similar fiberglass mat is included within each vane. Also, each vane includes a layer of lead.
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