Flat Oval Spiral Duct Watch the underneath online video to see the installation of oval duct and fittings. See that the reducer being used is undersized on its collar making it possible for the oval duct to slide above the collar. These are utilizing Unistrut with threaded rods as hangers https://ovalconduit13344.blogrenanda.com/43217494/new-step-by-step-map-for-round-conduit