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250mm Waterproof IP55 Ec Backward Curved Centrifugal Fan for Cooling. Five Years Warranty: Comprehensive warranty coverage for all EC fan products. IP55 Waterproof Protection: Dust and water jet resistant design for reliable operation. 0-10VDC/PWM Speed Control: Precise speed regulation with tachometer output signal. Fast Sample Delivery: Sample production completed within 3 days. Multiple Certifications: Certified with UL, CE, RoHS, CCC, and ISO standards. Customization Available: Flexible customization options from samples or designs.