Flat Oval Spiral Duct Look at the down below video to begin to see the set up of oval duct and fittings. Discover the reducer getting used is undersized on its collar permitting the oval duct to slip around the collar. These are utilizing Unistrut with threaded rods as hangers https://roundconduit02344.worldblogged.com/42750364/new-step-by-step-map-for-round-conduit