Flap (7) intended to alter the flow of a fluid, called the first fluid, said flap (7) being constituted by a metal strip (10), said metal strip (10) comprising at least a part of deployed metal having a surface comprising meshes (30), called a meshed surface (15), characterized in that said fin (7) comprises at least one blind (16) that is composed of a slit (17) and a shutter (18), made in the meshed surface (15) and intended to form a flow deflector of the first fluid.
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