Patent ID: 7913718

Claim:
A noise reduction system for reducing the noise level in a pipe of a DWV system, which comprises: a) a spacer mounted on an outer surface of the pipe; and b) a sleeve having a cylindrical shape similar to a shape of the pipe and constructed of a first piece and a second piece with each piece having an essentially semi-circular cross section, the first and second pieces having opposed ends with first and second edges extending between the ends, wherein a snap fastener is provided along the first and second edges of the first and second pieces such that a male portion of the snap fastener extends along the first edge of the first and second pieces and the female portion of the snap fastener extends along the second edge of the first and second pieces, wherein the sleeve is mounted on the spacer on a side opposite the pipe so that the sleeve is spaced apart from the outer surface of the pipe and an air gap is formed between the outer surface of the pipe and the sleeve wherein the air gap absorbs sound emitted by the pipe, wherein the spacer essentially completely fills a space between the pipe and the sleeve and wherein when the first and second pieces of the sleeve are mounted on the pipe, the male portion of the snap fastener engages the female portion of the snap fastener to secure the sleeve on the pipe.