Sound-absorbing device, especially for damping of noises expanding in air ducts

摘要

A flow duct for the delivery of air for ventilation is of round cross section and is surrounded by a prismatic casing over the length of the duct. Sound-absorbing material is filled into the space between the casing and the duct and varies in radial thickness around the periphery of the duct as measured in a plane perpendicular to the axis thereof.