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400mm Square Plate External Rotor Axial Fan Wall Mounted Exhaust Fan. CE Certified Quality: Passed EU CE certification with strict QC system in every process. Comprehensive Warranty: One-year warranty with free replacement and freight coverage for quality issues. High Efficiency Motor: YWF series motors with IP44 protection and ball bearings for durability. Low Noise Performance: Designed for quiet operation with noise levels as low as 58 dB(A). Long Service Life: Expected lifespan of 3-5 years, potentially lasting 8-10 years with feedback. Flexible Customization: Supports full customization including voltage, frequency, CFM, and speed.