NOISE SUPPRESSION SYSTEM

PROBLEM TO BE SOLVED: To provide a noise suppression system capable of surely obtaining noise suppression effect by specifying an installation position of a noise suppressor.SOLUTION: A noise suppression system includes: a duct line having openings at both ends and connected to a noise source at the first opening out of the openings; and a tubular noise suppressor disposed while projecting radial outward, on a wall surface of the duct at a position separating to the second opening side, from the first opening of the duct line, communicated with the duct line, at an end portion on the wall surface side, of the tubular noise suppressor, and closed at the another end portion. When a wavelength of noise generated from the noise source is denoted by λ, a length of the noise suppressor is set to be λ/4, and a length from the first opening of the duct line to a joining position of the noise suppressor, and a length from the second opening of the duct line to the joining position of the noise suppressor are set to be (2n+1)λ/4 (n is a natural number including 0 and may be equal or different in both lengths).