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133mm Low Noise FFU Air Handing Unit Ec Backward Centrifugal Fan. Up to 50% energy savings with high-efficiency EC motor technology and maintenance-free 50,000-hour lifespan. Ultra-low noise operation thanks to the aerodynamically optimized backward-curved impeller design. Flexible smart speed control via 0-10V/PWM/MODBUS, with complete built-in protection for safe and reliable 24/7 running.