SPIRAL LOCKSEAM LOUVERED TUBES Newcan is capable of manufacturing spiral lockseam louvered tubes that range in size according to outside diameters from 1 inch to 10 inches, and tube lengths of 2 inches to 120 inches. • External or Flush lockseams • Materials: Electrolytic Tin plate, Stainless Steel, Cold Rolled Steel, Aluminum and Galvanized Steel. • Increased strength to material thickness • Single or double louvered for varying open areas • Material thickness: Ranging from .008 inches to .022 inches. (click on photo for a larger image)