This Lambro 10 in. x 8 ft. Flexible Semi-Rigid Aluminum Duct is recommended over conventional semi-rigid and foil ducts, the Class 0 duct requires no elbows as it can form tight 90° turns requiring less space to work, the design creates airtight seams and prevents unraveling while handling, the semi-rigid duct is reinforced with bead wire helix to always maintain its round shape and is suitable for all general-purpose venting applications including exhaust venting, bathroom fan venting, range hoods and more, it is installer-friendly and can be uncompressed easily for installation. Unlike conventional semi-rigid ducts that take up large amounts of space, this duct has a compact compression that is 4x smaller than many current ducts on the market. This reduces space needed for transportation, warehouse and shelf space in store. Color: Silver.