Patent ID: 8827033
Filing Date: 2014-09-09
Classification: B32B,E04B,G01K,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 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 extending into the cavity, wherein the noise absorbing muffler comprises: an outer barrier layer that limits the passage of sound waves emitted from the recessed mechanism therethrough; and at least one noise absorbing layer positioned adjacent the outer barrier layer, wherein the noise absorbing layer absorbs a predetermined amount of sounds waves emitted from the object, wherein the length of the cavity defined by the noise absorbing muffler is selected, based upon the frequency of the noise to be absorbed, such that the noise absorbing layer substantially absorbs the sound waves emitted by the object; and wherein the elongated cavity has open ends.