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400mm Ahu Ventilation 230V Ec Centrifugal Fan with Integrated Speed Control. EC Brushless Motor: High efficiency EC brushless external rotor motor for energy saving. Versatile Speed Control: Supports 0-10VDC and PWM signals for precise speed regulation. Robust Protection Features: Includes locked-rotor, reverse polarity, thermal protection, and soft start. Durable Aluminum Construction: Impeller made of aluminum for lightweight and corrosion resistance. IP44 Protection Rating: Solid protection against solid objects and water splashes. Multiple Certifications: Certified by RoHS, ISO, and CE for global compliance and safety. OEM/ODM Services: Customization services available for specific manufacturing needs.