Abstract: The invention relates to a corner accessory for placing at the junction between at least two ducts that extend in different directions, the accessory comprising two distinct flaps, one of which has a projecting element and the other of which includes an elongate opening, said projecting element being engaged in said elongate opening so as to move along a longitudinal direction of said opening to allow said flaps to move relative to each other. According to the invention, said elongate opening has a longitudinal edge parallel to said longitudinal direction and opening out locally to a slot that opens out into a free edge of said flap.

Abstract: The invention relates to a corner accessory for placing at the junction between at least two ducts that extend in different directions, the accessory comprising two distinct flaps, one of which includes a projecting element and the other of which includes a circular opening receiving said projecting element to allow said flaps to pivot about a pivot axis, the circular edge of said opening opening out locally to a straight slot that extends radially relative to the circular edge of said opening and that opens out into a free edge of said flap. According to the invention, said projecting element is a cylindrical wall presenting firstly an outside diameter equal, ignoring clearance, to the inside diameter of said circular opening so that during pivoting of one flap relative to the other, the outside face of said cylindrical wall slides over the edge face of the circular edge of said opening, and presenting secondly a height that varies around its circumference.