Flat Oval Spiral Duct Enjoy the below movie to begin to see the installation of oval duct and fittings. Discover the reducer getting used is undersized on its collar enabling the oval duct to slide around the collar. They are really making use of Unistrut with threaded rods as hangers https://roundconduit89000.boyblogguide.com/35507506/detailed-notes-on-round-conduit