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By certification 
Features
· Patented and innovative Electrostatic Precipitator (ESP) technology from Sweden enables a filtration efficiency of more than 97% which defeats traditional ESP with only 80% efficiency.
· Washable ESP filter needs no replacement which contributes for cost saving and eco-friendly.
· Three brushless fans bring strong air flow quietly. Their long life span can last more than 50, 000 continuous working hours.
· Speed control: L, M, H. three different speeds for different environment and time. Help to refresh the breathing efficiently and economically.
· Timer Control: the machine can be switched off automatically at 2h, 4h, 8h interval.
