US Duct - Welded Flange

Welded flange refers to flanges that are welded to the duct. The faces of the flanges are the mating surface, as opposed to the Vanstone where the duct lips are mating. Full welded duct flanges have a continuous weld. Intermittently welded duct flanges mean that there is a weld at intervals around the duct. Standard welded flange pipe lengths are a nominal 60”.