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silent exhaust fan ceiling duct mounted 150mm for big bathroom ventilation Features: Combine the acoustic and duct working principle, special design for excellent sound attenuation. The shell is made of polypropylene plastic, with high anti-acid capability. The impeller is made of ABS, designed by hydromechanics to reach the optimal air and pressure. Two-speed motor, Japanese brand NMB ball bearing, long working life to 50,000 hours. IP44 protection class, waterproof and