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Features:1.Taiwan brushless motor, low noise, high speed, stable operation, long life, low energy consumption, high efficiency.2.PWM speed control, according to the amount of dust to achieve precise adjustment.3.Four layers filter design  to ensure that the filtration of harmful substances in the smoke completely, to achieve indoor air quality standards, protect the environment and human health.4.The primarily efficient filter, the Medium efficiency filter and the main filter element can be replaced individually, which can prolong the service life of the filter element and reduce the cost of t