This is a very high-temperature resistant, sturdy, and integrated pipeline variable diameter increase pipe, which can be used to connect two different solid or flexible pipes or pipelines to a ventilator. Small. Suitable for the HVAC ventilation system, bathroom exhaust, air-cooled hood, embedded fans, hood, roller dryer, hydroponic system, kitchen or apartment, family garage attic or office space use together. Specification Material: Galvanized Steel Color: Silver Tone Biggest Outer Dia.: 300 mm / 12 Inches. Smallest Outer Dia: 250 mm / 10 Inches. Length: 200 mm / 7.9 inches. Package List: 1 pcs Duct Reducer Advantage The duct adapter is made of galvanized steel material, which is not easy to rust and corrode, and the surface is treated very smooth.Galvanized iron retains the strength and toughness of ordinary carbon steel, so it has certain mechanical properties. Galvanized iron has better fire resistance than ordinary steel. And the ventilation resistance of galvanized air duct is small and will not cause noise. Instruction Raised lip on both openings allows connecting ducts to get a better grip. Connect the duct reducer to a metal duct, vent hose, fan outlet, or inlet, use a pipe clamp, glue, or tape to secure the connection if needed. Notice Please confirm the specification and size of the product before you buy it. The bite seam of the air duct should be tight and the width should be consistent. Reducing the diameter of the hem should be bent by a bending machine, and manual bending is prohibited.