Spiral Duct compared to traditional rectangular duct are numerous and compelling:  Attractive appearance Exposed Spiral duct is attractive and is frequently specified by architects because of its superior aesthetic appeal. Paintable Spiral duct can be finished to blend in with, or stand out from, the indoor environment. Economical to install–the unique attributes of Spiral duct can reduce installation costs: Easier to install through and around structural framing Longer spans reduces installation operations and the number of connections and hangers required