Flat Oval Spiral Duct Observe the beneath online video to see the installation of oval duct and fittings. See the reducer getting used is undersized on its collar allowing for the oval duct to slip about the collar. They're applying Unistrut with threaded rods as hangers to the ductwork. Reinforcement https://oval-conduit12344.bloggip.com/36704492/the-best-side-of-round-conduit