Multi-angle vertical flat elbow KRPV is used to connect air ducts of the corresponding cross-section at different angles from 3 to 49°. Provides rotations of the ventilation network, changes the direction of the channel. When installing the elbow, depending on the selected angle of rotation, the required number of segments is cut off, on the one hand, the pitch of each segment is 7.50 °. They are connected directly to channels of the appropriate cross-section. KRPV has projections on the walls for fixation and reliable connection to the air duct. The 620KRPV model is equipped with clamps that prevent sagging.