Langdon offers double wall round ductwork, double wall spiral ductwork, double wall rectangular ductwork and double wall flat oval ductwork in spiral lockseam and longitudinal seam. Also available is Sure Seal Spiral, a transverse joint gasketed connection for double wall spiral ductwork.
Our double wall duct and fittings are galvanized sheet metal with an inner fiberglass insulation. Also available is acrylic coated insulation that resists air erosion of fibers and the growth of fungus and bacteria. Langdon fabricates double wall ductwork with an inner perforated metal liner and fittings with an inner solid metal liner.
Langdon provides stainless steel and aluminum double wall duct and fittings for a wide range of environments, including hospitals, laboratories, food and pharmaceutical plants.