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Low Noise Warehouse Kitchen Industrial Axial Duct Wall Mounted Exhaust Fan. Low Noise Design: Special twisted curvature blades and flange flanging process ensure quiet operation with large air volume. Durable Copper Motor: Equipped with 100% copper wire motor for high efficiency and long service life. Anti-Corrosion Surface: Advanced spray-painting process keeps the surface clean, beautiful, and resistant to corrosion. Versatile Applications: Ideal for warehouse cooling, kitchen exhaust, workshops, and entertainment venues.