Flat Oval Spiral Duct Observe the below video clip to see the set up of oval duct and fittings. Observe that the reducer getting used is undersized on its collar allowing the oval duct to slide more than the collar. These are using Unistrut with threaded rods as hangers for https://juliusdvlzn.dreamyblogs.com/37012149/a-review-of-oval-conduit