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280mm Plastic Impeller FFU Low Noise Ahu Backward Centrifugal Impeller. Precision-balanced construction ensures smooth, vibration-free rotation, extending bearing and motor life. Wide application versatility-compatible with both AC and EC motors, suitable for HVAC, ventilation, and industrial air-moving systems. Aerodynamically optimized backward-curved blades deliver high static pressure with exceptionally low noise and turbulence.