[18]. High-temperature dc axial fan fans are therefore engineered with advanced materials and construction methods to withstand continuous operation in extreme thermal environments[14]. Components are frequently fabricated from heat-resistant alloys, such as specific grades of stainless steel or high-nickel alloys, which maintain structural integrity and prevent creep (deformation under stress) at elevated temperatures[18]. The motor and bearings, the most thermally vulnerable components, require specific protection. In some designs, such as Bifurcated Axial Fans, the motor is placed outside the main air stream within a separate tunnel or sleeve built into the fan casing, allowing the conveyed air to bypass the motor entirely and drastically reducing its operating temperature[18]. For applications where the motor must remain in the airstream, high-efficiency, class H or higher insulation is used for the motor windings, and specialized high-temperature bearing lubricants are employed. Furthermore, the use of special coatings on all internal surfaces helps resist thermal degradation, oxidation, and potentially corrosive gases often associated with high-heat industrial processes, ensuring reliable ventilation and safety in the most demanding thermal conditions.
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