Bullet Points: 1High-quality MaterialHeater Duct Hose is made of high-quality aluminum, which has the characteristics of high-temperature resistance, corrosion resistance, and long service life. 2B uilt-in Steel WireAluminum Duct Pipe is made up of steel wire spirals to hold shape and keep your ventilation system free of tears, and pinholes and resistant to leaks. 3Adjustable HoseInsulated Dryer Vent Hose can be expanded for an adjustable fit, and the length can be adjusted as needed for many different automotive, home and workshop uses. 4Easy to InstallAluminum Dryer Vent Hose is super flexible and easy to install because it slides right onto your duct fan, light reflector, vent exhaust, and carbon filter. 5Multiple ApplicationsFlexible Dryer Vent can move and transport air in kitchens (cooking exhaust), greenhouses, bathrooms (odor and moisture emission), drying rooms, grow tents, and other applications. 1. Used in a variety of ventilation, circulation, and heating and cooling transfer applications. 2. B uilt-in steel wire for enhanced and long-lasting performance. 3. Hose can be extended for adjustable fit. 4. Ducted fan systems for a variety of air circulation and ventilation projects. 5. Suitable air heaters, air paving heaters, automobiles, 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 shipping purposes, the product will be properly compressed and the size will vary upon receipt of the product, so be sure to stretch it to the desired length. The tube length is the stretched length, not the length of the tube package. Please stretch it slightly and fully to get the length you need. If you are unable to obtain the length, please have someone stretch it together.