Spiral duct and lined spiral duct are manufactured in-house using heavier-gauge materials than typical market offerings and stocked locally in diameters ranging from 4″ through 32″ for immediate availability on commercial HVAC projects throughout Central and South Texas. In addition to lined spiral pipe, elbows and fittings can also be internally lined to support acoustical and performance requirements, providing a fully integrated spiral duct system. With in-house duct design expertise, practical solutions are often developed and priced the same day, helping mechanical contractors resolve challenges quickly and keep projects moving.