HVAC duct connection system and flange

Abstract

A system for connecting a first HVAC duct section end flange to a second HVAC duct section end flange, the system comprising: a first corner flange (FCF) and a second corner flange (SCF), wherein both the first corner flange and the second corner flange comprise: a first leg and a second leg, the first and second legs integrally connected to one another at a respective first end, and each leg extending outwardly away from the respective first end away from the other leg; an interior surface extending along the first and second legs; an exterior surface extending along the first and second legs, the exterior surface disposed opposite the interior surface; at least one fastener aperture extending between the interior surface and the exterior surface, the fastener aperture including an integrally formed truncated cone extending out a height from the exterior surface, wherein the truncated cone has an inner diameter surface and a central axis and the inner diameter surface is unthreaded prior to the system being disposed in an assembled form; and at least one self-threading bolt having a shank and a head, the shank having a threaded section and an unthreaded section, the unthreaded section disposed axially between the threaded section and the head, the threaded section having a plurality of first threads with a thread diameter sized to engage the inner diameter surface of the truncated cone, and the unthreaded section having a second diameter that is less than the thread diameter; and wherein in the assembled form, the first HVAC duct section end flange and the second HVAC duct section end flange are adjacent one another and disposed between the first corner flange and the second corner flange, and the first corner flange is disposed contiguous with the first HVAC duct section end flange such that the FCF truncated cone extends away from the first HVAC duct section end flange, and the second corner flange is disposed contiguous with the second HVAC duct section end flange such that the SCF truncated cone extends away from the second HVAC duct section end flange; and wherein in the assembled form, the central axis of the FCF truncated cone is aligned with the central axis of the SCF truncated cone; and wherein in the assembled form, the at least one self-threading bolt is threadably engaged with a plurality of second threads cut into the inner diameter surface of the truncated cone of the second corner flange by the self-threading bolt and the unthreaded section of the self-threading bolt is disposed within the truncated cone of the first corner flange. HVAC DUCT CONNECTION SYSTEM AND FLANGE 20 26 22 03 15 21 A ug 2 02 6 H V A C D U C T C O N N E C T I O N S Y S T E M A N D F L A N G E 2 0 2 6 2 2 0 3 1 5 2 1 2 0 2 6 A u g

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