When handling general gases through air ducts, black steel plates should be cleaned of rust and coated with anti-rust paint to ensure long-term durability. For dust-laden gases, applying an anti-wear protective layer can help reduce damage from abrasive particles. In high-humidity environments, it's important to protect the outer surface of the duct against corrosion by performing proper anti-rust treatments. For galvanized steel ducts used to transport high-temperature or high-moisture gases, it's recommended to apply a phosphating primer or other corrosion-resistant coatings on the inner walls. This helps prevent degradation caused by heat and moisture. When transporting hot gases or cold air, insulating the outer surface of the duct is essential for thermal protection—whether for heat retention in winter or cooling in summer. The main goal of insulating high-temperature gas ducts is to minimize heat loss within the system, especially in centralized air conditioning setups during colder months. It also prevents excess heat from being released into the surrounding space, which could raise room temperatures. Additionally, insulation helps avoid accidental burns from contact with hot duct surfaces. In summer, if the temperature of the transported gas is below the dew point of the surrounding air, condensation may form on the outer wall of the duct. This not only increases energy losses in the cooling system but can also lead to water droplets dripping onto ceilings and walls, causing damage and unsightly stains. To prevent these issues, proper insulation is necessary in such cases as well. By following these guidelines, you can significantly extend the lifespan of your air duct system, improve energy efficiency, and maintain a safer and more comfortable indoor environment.
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