Flat Oval Spiral Duct Check out the below movie to begin to see the installation of oval duct and fittings. Observe which the reducer getting 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 https://roundconduit34566.blogproducer.com/44008778/detailed-notes-on-round-conduit