Round duct is made use of to connect between fittings, equipment and flex duct. Manufactures ordinarily stock normal lengths, but Should you have your personal spiral device you may fabricate any duration. You've the choice of having the air dispersed by linear vents, set orifices,  fastened nozzles or adjustable nozzles. https://roundconduit70112.blogthisbiz.com/43750966/little-known-facts-about-round-conduit