The present invention includes: a body forming a chamber through which bypass air passes; an inlet boss protruding toward the chamber inside the body while forming an inlet through which the bypass air flows into the body; and an outlet unit which is connected to the body to discharge the bypass air to the outside of the chamber in a direction not coinciding with the protruding direction of the inlet boss and forms an outlet. The bottom of the chamber from which the inlet boss protrudes has an uneven depth along the circumference of the inlet boss.
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