The present invention relates to a flange binding structure of the duct that can improve the workability by making it easier to bind the reinforcing piece mounted on the flange of both ends of the duct.;The present invention is a structure for binding the flanges formed at both ends of the duct installed in the inner, outer wall or ceiling of the building to each other, a flat flange bent at both ends of the duct and the '-shaped reinforcement mounted on each corner of the flange The pieces are configured to bind to each other through a drawing part formed by a clinching process, and the bolts and nuts are fastened into a through hole formed in the center of the reinforcing piece so as to connect each duct to each other.;Duct, Flange, Reinforcing Piece, Packing, Through Hole
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