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Hi Mark, this is Krystal with Dyson. Thank you for your interest in the Dyson Pure Cool purifier. How often the filters need to be changed does depend on how often it is used. If used for 24 hours a day, it will need to be changed every 6 months. If used for 12 hours or less per day, it will need to be changed every year. Best Wishes, Krystal Dyson Customer Support
Sorry, there was a problem. Please try again later.I clean it weekly but change it every 6 months
Sorry, there was a problem. Please try again later.Your mileage varies depending on how dirty the air is at the location of the fan.
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