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Large Low Rpm Industrial Ceiling Ventilation Fan. Low RPM Operation: Adjustable speed from 0-60 RPM for gentle, large-scale ventilation. Durable Aluminum Alloy: Blades made of high-strength Aluminum-Magnesium Alloy for longevity. Energy Efficient Motor: Equipped with 1500W PMSM motor for stable and efficient performance. Comprehensive Certifications: Certified by ISO, CE, and CCC for international safety standards. Flexible Customization: Offers full customization including VFD control and specific voltage. Fast Delivery: Standard lead time within one week for most orders. OEM Service Available: Professional OEM and ODM services provided for brand customization.