PROFILED FLANGE FOR THE AIR-TIGHT CONNECTION OF AN AIR DUCT

摘要

The invention relates to a profiled flange (1) for air-tightly connecting two sections of an air duct. Said profiled flange (1) is designed as a hollow profiled element, the cross-section of which is essentially L-shaped and which is made of folded sheet metal, wherein the L-arms (2, 3) of the profiled flange (1) are double-walled and have an internal wall (4, 5) and an external wall (6, 7). In order to design a profiled flange that has significantly better stability and sealing properties compared to traditional profiled flanges, in the transition zone to the external wall (6) of the first L-arm (2), the external wall (7) of the second L-arm (3) has an intermediate section (18) having a convex, rounded shape complementary to the fold (9), wherein after being welded to a wall of the air duct section inserted into the insertion pocket, the profiled flange (1) is deformed such that the vertex (11) of the fold (9) is pressed in a planar way against the external wall (7) of the second L-arm (3) in the region of the intermediate section (18).