In HVAC systems, fiberglass ducts are widely used in commercial buildings, public buildings, and industrial plants due to their integration of air delivery, insulation, and noise reduction. However, when operating in high-humidity environments, duct systems face challenges related to condensation, moisture resistance, and durability. The actual performance of fiberglass ducts under such conditions becomes an important reference for engineering design and material selection. This article analyzes this from the perspectives of material properties and engineering applications.

Firstly, from the perspective of the material itself, fiberglass ducts are primarily composed of glass fiber. Glass fiber is an inorganic material, resistant to corrosion and mold growth, which is a prerequisite for its basic stability in high-humidity environments. However, the fiberglass structure has a certain porosity; without effective protection, moisture can still penetrate the interior during long-term operation, affecting system performance.

Secondly, the surface covering plays a crucial role in adaptability to high-humidity environments. Commonly used fiberglass ducts in engineering typically have composite aluminum foil, fiberglass cloth, or moisture-proof coatings on both the inner and outer surfaces to enhance vapor barrier and moisture resistance. In high-humidity environments, the integrity of the surface covering is particularly important. If the surface is damaged or the joints are not properly treated, moisture can easily seep into the fiberglass layer through weak points, leading to localized moisture absorption and affecting insulation and structural performance.

Third, the risk of condensation in high-humidity environments is one of the core factors affecting the performance of fiberglass ducts. When the supply air temperature is low and the ambient humidity is high, the outer surface temperature of the duct may be lower than the ambient dew point, resulting in condensation. Appropriate selection of duct thickness, optimization of system operating parameters, and the use of continuous vapor barriers can help improve the stability of the outer surface temperature and reduce the probability of condensation.

Fourth, construction quality has a decisive impact on the performance of fiberglass ducts in high-humidity environments. Duct joints, flange interfaces, and locations where walls and floors pass through are high-risk areas for moisture intrusion. Proper construction should ensure tight seals at joints, uniform application of adhesive, and continuous overlap of the surface covering to avoid creating moisture channels. These details directly relate to the long-term stability of the duct under high-humidity conditions.

Fifth, from the perspective of system operation and maintenance, fiberglass ducts in high-humidity environments require more scientific management. Regularly inspecting the surface coating of air ducts and promptly repairing damaged areas helps prevent problems from escalating. Simultaneously, properly controlling system humidity and air supply conditions are also crucial for ensuring duct performance.

Overall, fiberglass ducts have a certain application basis in high-humidity environments. Their actual performance depends on the material coating design, system thermal conditions, and the quality of construction and maintenance. Through proper selection, standardized construction, and scientific operation management, fiberglass ducts can maintain good stability and performance in high-humidity environments, providing effective support for the long-term reliable operation of HVAC systems. This is one of the important reasons for their continued adoption in buildings with complex environments.