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HVAC Duct Insulation, High Temperature Heat Insulation Air Duct. Customizable Color: Available in blue, yellow, gray, and other customized colors. Customizable Length: Standard lengths of 8, 10, 12, or 14 inches, fully customizable. Flexible and Bendable: Soft, retractable design with spiral steel wire for easy connection. Fire Resistant Material: Made of fireproof fiberglass and silicone gel coating for safety. Multi-Industry Application: Used in firefighting, HVAC, chemical, tunnel construction, and mining. Certified Quality: Passed ISO 9001, SGS, and CE certifications for global standards.