Round duct is used to connect amongst fittings, extras and flex duct. Manufactures usually inventory regular lengths, but In case you have your individual spiral equipment you could fabricate any duration. I ponder if the builder as well as sparky he employed all wore stetsons - from this (and previous https://ovalconduit34445.blogsvirals.com/35688165/not-known-facts-about-oval-conduit