Inventors:
Harry M. DeVane - Oxnard CA
International Classification:
F01N 112
Abstract:
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.