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5" 125mm Customerized Super Air Volume Exhibition Hall Inline Duct Fan with Timer Features: The shell is made of one-time disposable PP, with high anti-acid ability. The impeller is made of ABS, designed by hydromechanics to reach the optimal air and pressure. Double speed motor, Japanese brand NMB ball bearing, long working life up to 50,000 hours. IP44 protection class, waterproof and dustproof more effective. Can be designed with a timer function, temperature sensors and