Round duct is applied to attach in between fittings, components and flex duct. Manufactures usually stock common lengths, but if you have your own personal spiral device you could fabricate any length. You have the option of getting the air dispersed via linear vents, fastened orifices,  fixed nozzles or adjustable https://round-conduit91233.popup-blog.com/35578949/the-ultimate-guide-to-round-conduit