Material: ALUMINUM Assembled Product Length: 96" Assembled Product Height: 4" Assembled Product Width: 4" Diameter: 4" . Flexible Aluminum Ducting This Class 0, non-combustible duct is constructed of a special aluminum alloy that prevents corrosion and metal fatigue Machine fabrication produces a continuous lock seam that permits the duct to be pulled open, compressed, bent, and re-bent without developing leakage It can be used for concealed venting and eliminates the need for elbows Various applications include dryer venting, air conditioning, fresh air intakes, heating, and exhausting