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250mm High Efficiency Ec Backward Curved Centrifugal Fan with Bracket. EC Brushless Motor: High efficiency EC brushless external rotor motor for energy saving. 250mm Centrifugal Fan: 250mm impeller diameter with backward curved design for high pressure. Precise Speed Control: Supports 0-10VDC and PWM speed control for flexible operation. Comprehensive Protection: Features IP44 protection, thermal, locked-rotor, and reverse polarity protection. Certified Quality: Products certified with RoHS, ISO, and CE standards. Custom Solutions: OEM/ODM services available for customized fan types and specifications. 24-Month Warranty: Comprehensive 24-month warranty covering finished products.