The present invention uses Bernoulli's principle to increase the flow rate of outside air to induce the exhaust flow of indoor air to be discharged upwardly so that it is discharged quickly, and to provide a headwind prevention hood cap whose structure itself is not affected by the headwind. have. The above object of the present invention is a cylindrical or semi-cylindrical hollow tube body and a horizontal communicating tube for duct connection, An expansion pipe communicating with the horizontal outlet of the horizontal communication pipe, and a neck pipe extending from the upper end of the horizontal outlet to the upper end of the expansion pipe and shrinking upward. It has a vertical guide tube having a reduced tube extending to the outlet of the neck tube, and a streamlined guide surface with maximum convex curvature arranged toward the horizontal outlet side of the horizontal communication tube on the opposite side of the vertical flat surface, and the extension tube and the neck of the vertical guide tube Including a guide partition plate for partitioning the tube, External air flowing in from the lower part of the expansion pipe and flowing into the reducing pipe is accelerated to a fast air flow by the streamline guide surface of the maximum convex curvature, and the indoor air discharged from the horizontal outlet of the horizontal communication pipe is drawn upward and discharged quickly. It can be achieved by a headwind prevention hood cap configured to fundamentally block the inflow of headwind by making the outside circular.
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