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Sorry, there was a problem. Please try again later.Thank you for your inquiry. The replacement HEPA filter in this unit only needs to be replaced once per year. The pre-filter needs to be replaced once every three months. However, the pre-filter comes as a large sheet that needs to be cut to size. The amount of material the pre-filter comes with provides up to 8 different pre-filters, or up to 2 years worth of pre-filters. If you have any other questions please do not hesitate to contact our consumer relations team by emailing us at [email protected]. Thank you.
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