DUCT CONNECTING SYSTEM HAVING INTEGRAL TRANSVERSE FLANGES

摘要

The invention relates to an improved system for connecting the ends of sheet metal ducts wherein each duct end is provided with an integral frame. Corner connectors defining perpendicularly extending arms are associated wi th each frame, and bolts or other fasteners are utilized for connecting the connectors and integral frames. The sections include an upturned portion extending perpendicularly outwardly from the duct wall, a second portion ben t rearwardly from the outer end of the first portion, a third portion extendin g from the outer end of the second portion and forming an L-shaped double wall portion. When the frame is formed in this fashion, it is adapted to receive the side edges of respected arms of corner connectors whereby the ducts may be efficiently assembled by locating corner connectors in place and thereafter applying the fasteners used for maintaining the assembly.