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Plastic PVC Spiral Reinforced Flexible Ventilation Air Duct with Steel Ring for Mining. Customizable Dimensions: Diameter 200-3200mm and Length 10-300m available upon request. Multi-Color Options: Available in Yellow, Black, Orange-Red, and Green. High Tensile Strength: Customizable material strength ensures durability in warp and weft. Flame Retardant: Meets EU and US safety standards for fire resistance. Anti-Static Material: Options available to prevent static buildup during use. Eco-Friendly & Odorless: Made of PVC composite polyester fiber, safe for human health. Low Air Leakage: Hot-air welding technology ensures excellent airflow performance. Wide Temperature Range: Operates effectively from -40 to 80 degrees Celsius.