Abstract: Provided is a silencer including: an expansion chamber having a cuboid shape; a first pipe for being coupled to a noise source, the first pipe being coupled to an approximate center of a first surface of the expansion chamber; and a second pipe coupled to an approximate center of a second surface of the expansion chamber adjacent to the first surface. The expansion chamber has an internal space and a partition in the internal space, the partition is disposed upright on a third surface of the expansion chamber opposed to the second surface of the expansion chamber to extend from the third surface toward the second surface, and the second pipe has a central axis substantially included in the partition.

Abstract: Provided is a silencer including: an expansion chamber having a cuboid shape; a first pipe for being coupled to a noise source, the first pipe being coupled to an approximate center of a first surface of the expansion chamber; and a second pipe coupled to an approximate center of a second surface of the expansion chamber adjacent to the first surface. The expansion chamber has an internal space and a partition in the internal space, the partition is disposed upright on a third surface of the expansion chamber opposed to the second surface of the expansion chamber to extend from the third surface toward the second surface, and the second pipe has a central axis substantially included in the partition.

Abstract: An air cleaner of this disclosure includes a hollow case, a filter element, and an opening end member. The hollow case defines an expanded space; the filter element defines an upstream-side expanded space and a downstream-side expanded space in the expanded space; the case includes an intake port configured to bring an upstream-side duct into communication with the upstream-side expanded space; the opening end member is formed from a material having an air permeability in a range of 0.3 to 100 sec/300 cc, and is integrated on an inner side of the intake port so as to project into the upstream-side expanded space and so as to extend a duct wall of the intake port; and D representing a diameter of the opening end member and L representing a length thereof satisfy 0.25D?L?2.0D.

Abstract: An air cleaner of this disclosure includes a hollow case, a filter element, and an opening end member. The hollow case defines an expanded space; the filter element defines an upstream-side expanded space and a downstream-side expanded space in the expanded space; the case includes an intake port configured to bring an upstream-side duct into communication with the upstream-side expanded space; the opening end member is formed from a material having an air permeability in a range of 0.3 to 100 sec/300 cc, and is integrated on an inner side of the intake port so as to project into the upstream-side expanded space and so as to extend a duct wall of the intake port; and D representing a diameter of the opening end member and L representing a length thereof satisfy 0.25D?L?2.0D.