An air filter is provided that includes, but is not limited to an air filter housing, which encloses an air filter chamber having an ambient air volume and a filtered air volume separated from the ambient air volume by a filter device. At least one interior side of the air filter housing enclosing the ambient air volume has ribs. The ambient air volume has air flowing through it in a flow direction operation of the air filter and sections of the ribs are situated parallel to this flow direction of the air and curved.
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