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133mm Low Noise High Airflow IP55 Air Condition 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.