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Tunneling PVC Coated Ventilation Duct Fabric. Customizable Dimensions: Width up to 3.20m, length 1-320m, and diameter 600-3000mm available. High Strength & Durability: Tensile strength 1500-3000 N/50mm with high wear and tear resistance. Flame Retardant Certified: Meets EN-71, UL94, and DIN4102 flame retardant standards. Chemical & Acid Resistance: Resistant to high temperature, acid, alkali, and oleic acid. Custom Color Options: Available in black, yellow, orange, white, or customized colors. Large Production Capacity: Annual production of 2,000,000m ventilation ducts and 15,000,000 m2 fabric. Easy Installation Design: Features hanging hooks every 1 meter and standard coupling for fast setup.