Round duct is applied to attach among fittings, components and flex duct. Manufactures usually stock common lengths, but if you have your individual spiral device you could fabricate any length. We source our round duct and fittings with lots of connecting techniques. Slip Couplings, AccuFlanges, QuickDraw bands, swaged / expanded https://roundconduit88900.ageeksblog.com/35350428/fascination-about-round-conduit