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Fire Resistant Light Weight Durable Aluminum Flexible Air Duct. Fire Resistant Material: Made of aluminum foil and steel wire helix with fireproof performance. High Air Velocity Capacity: Supports maximum air velocity up to 30 m/s. Durable Construction: Reinforced with steel wire helix for structural integrity. ISO Certified Quality: Manufactured with ISO certification standards. Flexible Diameter Options: Available in diameters ranging from 3 inches to 20 inches. Standard Length Variants: Offered in standard lengths of 7.5 meters or 10 meters. Efficient Packaging: Packed in carton boxes, 7.5 or 10 meters per box.