Adjustable fit: The duct features an adjustable string, allowing compatibility with multiple fan port sizes. Its smooth inner wall enhances the sealing environment and increases exhaust air volume for improved efficiency. Designed for ventilation applications: This flexible duct isfor exhaust ventilation in various settings including factories, basements, farms, and industrial environments. installation: Multiple stainless steel D-shaped lifting rings on the duct provide excellent support, allowing for fixation without movement. Available in lengths of 5m with 3 D-rings and 10m with 6 D-rings. construction: Made from thickened PVC plastic cloth, this ventilation pipe is ,and wear-resistant, long-lasting performance. Its lightweight and flexible design allows for easy handling. WIDE APPLICATION: Our hose designed for ventilation applications including duct fans and vent exhausts in factories, basements, farms, chemical, tunnel and automobile manufacturing, ect, Manufacturer: DUBTEDHOU