A ceiling structure comprising a. a structural ceiling that is a source of noise vibrations; b. hangers that form a noise path for the noise vibrations, and that extend downward from the structural ceiling; and c. a suspended ceiling that includes grid beams comprising a web and a bulb, supported by the hangers, that is a receiver for the noise vibrations; d. a noise damper of flexible sound vibration damping material, characterized in that the ceiling structure further comprises: a knock-out in the web of the grid beam, the noise damper being inserted into the knock-out, that insulates a hanger from the grid beam and absorbs the noise vibrations coming down the hanger, the noise damper having a) a raised insert on a lower segment of the noise damper that conforms in shape to the knock-out in the web of the grid beam; b) a lower lip at the bottom of the raised insert that engages a lower section of the knock-out to secure the bottom of the noise damper to the grid beam; c) an upper lip at the top of the raised insert capable of securing the raised insert in the knock-out when the lower lip on the raised insert is engaged with the lower portion of the knock-out; d) an inverted U-shaped upper portion of the noise damper that extends from the raised insert over the bulb of the grid beam to, along with the lower section of the noise damper, including the raised insert on such lower section, isolate the grid beam from a hanger that extends through a hole in the lower section of the noise damper. a. a structural ceiling that is a source of noise vibrations; b. hangers that form a noise path for the noise vibrations, and that extend downward from the structural ceiling; and c. a suspended ceiling that includes grid beams comprising a web and a bulb, supported by the hangers, that is a receiver for the noise vibrations; d. a noise damper of flexible sound vibration damping material, characterized in that the ceiling structure further comprises: a knock-out in the web of the grid beam, the noise damper being inserted into the knock-out, that insulates a hanger from the grid beam and absorbs the noise vibrations coming down the hanger, the noise damper having a) a raised insert on a lower segment of the noise damper that conforms in shape to the knock-out in the web of the grid beam; b) a lower lip at the bottom of the raised insert that engages a lower section of the knock-out to secure the bottom of the noise damper to the grid beam; c) an upper lip at the top of the raised insert capable of securing the raised insert in the knock-out when the lower lip on the raised insert is engaged with the lower portion of the knock-out; d) an inverted U-shaped upper portion of the noise damper that extends from the raised insert over the bulb of the grid beam to, along with the lower section of the noise damper, including the raised insert on such lower section, isolate the grid beam from a hanger that extends through a hole in the lower section of the noise damper. a knock-out in the web of the grid beam, the noise damper being inserted into the knock-out, that insulates a hanger from the grid beam and absorbs the noise vibrations coming down the hanger, the noise damper having a) a raised insert on a lower segment of the noise damper that conforms in shape to the knock-out in the web of the grid beam; b) a lower lip at the bottom of the raised insert that engages a lower section of the knock-out to secure the bottom of the noise damper to the grid beam; c) an upper lip at the top of the raised insert capable of securing the raised insert in the knock-out when the lower lip on the raised insert is engaged with the lower portion of the knock-out; d) an inverted U-shaped upper portion of the noise damper that extends from the raised insert over the bulb of the grid beam to, along with the lower section of the noise damper, including the raised insert on such lower section, isolate the grid beam from a hanger that extends through a hole in the lower section of the noise damper. a) a raised insert on a lower segment of the noise damper that conforms in shape to the knock-out in the web of the grid beam; b) a lower lip at the bottom of the raised insert that engages a lower section of the knock-out to secure the bottom of the noise damper to the grid beam; c) an upper lip at the top of the raised insert capable of securing the raised insert in the knock-out when the lower lip on the raised insert is engaged with the lower portion of the knock-out; d) an inverted U-shaped upper portion of the noise damper that extends from the raised insert over the bulb of the grid beam to, along with the lower section of the noise damper, including the raised insert on such lower section, isolate the grid beam from a hanger that extends through a hole in the lower section of the noise damper.