Introducing our versatile ventilation duct, designed to meet your diverse air circulation needs with ease and efficiency. This expandable and contractible duct features a unique blend of thickened silicone, fiberglass cloth, and spiral steel wire, ensuring durability and reliability in various environments. With a length of 13 feet (157 inches or 400 cm) and a flexible diameter ranging from 20mm to 305mm, our ventilation hose adapts seamlessly to your specific requirements, making it ideal for both residential and industrial applications. Whether you're setting up a temporary cooling system, improving air quality in your workspace, or enhancing your home's ventilation, this practical solution is your go-to choice. Experience the benefits of a lightweight, wear-resistant, waterproof, and flame-retardant design, which not only ensures safety but also simplifies storage and transport. The easy bending capability allows you to maneuver the duct into tight spaces without compromising airflow, making it a perfect fit for various scenarios, from DIY projects to professional setups. Included in the package is one high-quality tubing hose, ready to fulfill your ventilation needs. Please note that slight variations in color may occur due to different monitor settings, and allow for minor measurement discrepancies of 1-2 cm due to manual measurement. Elevate your air management solutions with our reliable ventilation duct – the ideal choice for efficiency and practicality.