In-Wall Dryer Venting System; Duct Type In-Wall; Kit Content (1) Oval to Round Top Boot, (3) 4 Inch Diameter x 32 Inch Length Oval Pipe with Support Strip, (1) 4 Inch Diameter Oval to Round 90 Degree Fitting; Hose/Duct Length 32 Inch Length; Used On Dryer; Material Aluminum; Material Thickness 0.014 Inch; Burning Character Flame Spread 0, Smoke Developed 0; Temperature Rating -100 to 430 Deg F