Round duct is applied to attach involving fittings, accessories and flex duct. Manufactures normally inventory conventional lengths, but When you've got your individual spiral device you'll be able to fabricate any size. On new builds, plasterers can plaster above capping better than oval conduit, if fixed directly to the blockwork. https://ovalconduit12348.bloggip.com/36663752/not-known-facts-about-oval-conduit