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Large Size 400mm Customized Efficient Ahu Ec External Axial Fan. High-efficiency EC motor delivers up to 50% energy savings compared to AC alternatives, with a maintenance-free lifespan of over 40,000 hours. External rotor design enables compact structure, high airflow output, and excellent heat dissipation for space-constrained installations. Smart speed control via 0-10V/PWM/MODBUS, with comprehensive overload, overvoltage, and locked-rotor protection for reliable 24/7 operation.