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High Efficiency Wall Mounted Shutter Exhaust Fan 1380*1380mm. Corrosion Resistant Frame: Frame made of 275g/sqm hot-dip galvanized steel for high anti-corrosion performance. Durable Stainless Blades: 430 stainless steel blades ensure large airflow, no deformation, and long service life. Multi-Application Design: Suitable for poultry houses, livestock breeding, greenhouses, and factory workshops. High-Strength Components: Features aluminum-magnesium alloy pulleys and imported waterproof bearings for stability. Certified Quality: Product holds RoHS, ISO, CE, and CCC certifications for global market compliance. Easy Maintenance: Belt and motor design allows for easy replacement and free maintenance of bearings.