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Blue Color Flame Retardant Industrtial Spiral Flexible Air Blower Duct. Flame Retardant Certified: Fire resistant certified and approved by SGS for safety in high-risk environments. Heavy Duty Construction: Made of PVC fabric with spiral steel wire and tear-proof rubber strip. Multi-Color Options: Available in Orange, Yellow, Blue, White, and Black colors. Durable Material Features: Wear & tear proof, acid/alkali resistant, waterproof, and UV resistant. Customizable Sizes: Standard sizes 100mm-1500mm with custom size options available. Versatile Applications: Suitable for mining, firefighting, tunnels, and industrial ventilation. Flexible & Lightweight: Lightweight design for easy carry, operation, and flexible suspension.