Premium thickened aluminum foil composite construction ensures superior durability and heat resistance for long-lasting performance. High-flexibility telescopic design allows effortless extension up to 3 meters with smooth compression for space-saving storage. Reinforced PVC inner layer prevents air leakage while maintaining optimal airflow efficiency in demanding environments. Professional-grade ventilation solution perfect for kitchen exhaust systems, workshop air extraction, and HVAC fresh air installations. Seamless aluminum-PVC bonding technology eliminates delamination risks even under continuous vibration. Precision-engineered spiral wire structure provides crush resistance while permitting tight-radius bends without kinking. Universal connector compatibility fits standard 100mm/125mm/150mm exhaust fans and ducting systems. Industrial-strength applications include restaurant hood vents, laboratory fume extraction, and commercial dryer ducting.