Flat Oval Spiral Duct View the underneath video to see the installation of oval duct and fittings. Detect which the reducer being used is undersized on its collar making it possible for the oval duct to slide more than the collar. These are using Unistrut with threaded rods as hangers https://felixjbqer.bloggerbags.com/42026670/rumored-buzz-on-oval-conduit