Patent ID: 9737840
Date: 2017-08-22
CPC Classifications: B01D

Claim:
1. An air cleaner comprising: a hollow case; a filter element; and an opening end member, wherein 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, and an exhaust port configured to bring a downstream-side duct into communication with the downstream-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 measured by a method in conformity with the Gurley test method defined in JIS P8117, 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, in an axis direction of the intake port, of a portion of the opening end member that is not fitting the intake port satisfy 0.25D≦L≦2.0D.