Flat Oval Spiral Duct View the below movie to see the installation of oval duct and fittings. Observe which the reducer being used is undersized on its collar letting the oval duct to slip in excess of the collar. They are employing Unistrut with threaded rods as hangers for that https://beaundrfs.blogdomago.com/35393886/a-simple-key-for-round-conduit-unveiled