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Fresh Air System PVC Composite Hose Air Duct Aluminum Foil Pipe. Acid and Alkali Resistance: Boasts superior chemical resistance against acids and alkalis. Fire Resistance: Features superior fire resistance and flame retardancy properties. Multiple Color Options: Available in Black, Grey, and White color variants. Wide Size Range: Offers specifications from DN80 to DN350 (3.14" to 13.8"). 1-Year Warranty: Includes a comprehensive 1-year warranty period for peace of mind. ISO9001 Certified: Manufacturing process certified under ISO9001 quality standards. Customization Available: Supports OEM/ODM services and customization from samples.