Round duct is utilized to attach amongst fittings, accessories and flex duct. Manufactures normally stock common lengths, but For those who have your own spiral machine you can fabricate any length. I'm wondering When the builder along with the sparky he used all wore stetsons - from this (and former https://remingtonjznbp.p2blogs.com/35371940/5-easy-facts-about-round-conduit-described