Patent ID: 8490743
Filing Date: 2013-07-23
Classification: B32B,E04B,G10K

Abstract:
1. A noise attenuation system disposed in a structure including a wall or ceiling, the wall or ceiling including a board having an exposed surface and an opposite surface, comprising: a sound generating object disposed in or on the structure; and a noise absorbing muffler positioned within the structure and forming an elongated cavity and having an edge abutting the opposite surface of the board of the wall or ceiling, at least a portion of the object positioned at a cavity opening or extending into the cavity, or both, wherein the noise absorbing muffler comprises: wherein the noise absorbing layer absorbs a predetermined amount of sound waves emitted from the object, wherein a length of the cavity defined by the noise absorbing muffler is selected, based upon the substantially lowest frequency of the noise to be absorbed, the material used for the noise absorbing muffler and the materials surrounding the sound generating object, such that the noise absorbing layer substantially absorbs at least as much of the sound waves emitted by the object as does the structure surrounding the object, and wherein the outer barrier layer has a sound transmission class rating equal to or greater than the sound transmission class rating of the structure inclusive of any wallboard(s) and air space or any wallboard(s) and air space and insulation having been removed to dispose the object within or on the structure, and wherein the object requires ventilation within the structure and the cavity formed by the noise absorbing muffler permits the dissipation of heat emitted from the object.