Flat Oval Spiral Duct Enjoy the beneath video to see the set up of oval duct and fittings. Notice that the reducer getting used is undersized on its collar allowing the oval duct to slide around the collar. They can be working with Unistrut with threaded rods as hangers with https://oval-conduit90112.blogoscience.com/43012500/a-secret-weapon-for-oval-conduit