Bullet points: Originally translated from English Hi High quality material: The heating cable is made of high quality aluminum, which is characterized by high temperature resistance, corrosion resistance and long service life. Built-in steel wire: Aluminum flexible tube is composed of spiral steel wires, to maintain shape and keep the vent system tear-free as well as pinhole-proof and leak-proof. Adjustable Hose: The insulated dryer vent hose can be expanded for an adjustable fit and the length can be adjusted as needed for a wide variety of automotive, home and workshop applications .Easy to Install: The aluminum dryer vent hose is super flexible and easy to install as it slides directly onto the duct fan, reflector, vent exhaust and carbon filter.Mult Application: The flexible dryer vent can convey and transport air in kitchens (exhaust gas cooking), greenhouses, bathrooms (odor and moisture emissions), drying rooms, grow tents and other applications. Description: Used in a variety of ventilation, circulation and heat transfer and cooling applications. Built-in steel wire for better and long-lasting performance. Hose can be extended to an adjustable matching. Duct fan systems for various air circulation and ventilation projects. Suitable for diese air heaters, air surface radiators, cars, trucks, boats, heavy machinery, agricultural machinery and industrial machinery. Specification: Material: AluMinum Product color: black Diameter: about 42mm, 60mm, 75mm/1.65in, 2.36in, 2.95in Length before stretching: about 30cm/11.81in long distance, after stretching: about 80cm/31.5in Product list: 1 * air heater duct hose Notes: For purposes shipping, The product will be compressed appropriately and the size will vary when you receive the product, so please stretch it to the desired length. The tube length is the stretched length, not the tube package length. Please stretch it slightly and fUlly to get the length you need. If you can't get the length, ask someone to stretch it together.