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220V 133mm High Pressure Plastic FFU DC Backward Centrifugal Fan. DC motor technology delivers efficient power conversion with low heat generation, supporting variable speed control for flexible system integration. Backward-curved impeller design ensures high static pressure, smooth airflow, and reduced noise levels across various operating points. Built-in intelligent protection includes soft-start, overcurrent, and reverse-polarity safeguards, ensuring reliable performance and extended product life.