SILENCER FOR VENTILATING AIR DUCT

摘要

PROBLEM TO BE SOLVED: To provide a silencer for a ventilating air duct that provides higher silencing performance and suppresses the generation of wind noise without changing the appearance size.

SOLUTION: The silencer for a ventilating air duct is disposed at some midpoint along the ventilating air duct and silences noise passing through the ventilating air duct. The silencer has a square-barrel-shaped casing 4 having an opening end 2a facing toward an upstream ventilating air duct 3a and the other opening end 2b facing toward a downstream ventilating air duct 3b. A first noise absorbing member 5a and a second noise absorbing member 5b each made up of a noise absorbing material 7 and a porous plate 6 are provided on opposing inner walls of the casing 4 in a direction from the upstream side to the downstream side of the passage, with a space interposed therebetween. The first noise absorbing member 5a is greater in thickness than the second noise absorbing member 5b.

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