The colored steel fiberglass duct is based on ultrafine fiber board and specially processed and composite. It integrates multiple functions such as insulation, noise reduction, moisture-proof and fireproof, anti-corrosion, aesthetics, high outer strength, and mold and antibacterial resistance on the inner surface. It has the advantages of light weight, small air leakage, fast production and installation, small space occupation, good ventilation, and reasonable performance and price. Especially its excellent insulation and noise reduction performance is favored by the majority of users.