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PVC Spiral Duct for Fans. Customizable Dimensions: Lengths from 1-320m and diameters 600-3000mm are fully customizable. High Strength Material: PVC coated polyester fabric with tensile strength up to 3000N/50mm. Flame Retardant Certified: Meets EN71-2, DIN4102, and UL94 flame retardant standards. Durable Steel Wire Structure: Supported by helix steel wire and rubber strip for wear-and-tear proof performance. Anti-Static Option: Optional anti-static feature with resistance <3*108 Ohms. Airtight Seams: Seams welded by hot air or HF to ensure airtightness and low leakage. Large Production Capacity: Annual production of 2,000,000m ventilation ducts meets high demand.