The H13 Hepa filter provides enhanced air cleaning capabilities, turning your dehumidifier into a combined dehumidifier and air purifier. The H13 Hepa is used in addition to the dust filter that comes as standard in the dehumidifier, so that you can get two stages of filtration.The Hepa filter can help remove mould spores, pollen, dust, pet dander, dust mites and more from the air. This is a true Hepa filter which means that they conform to tough international standards to ensure that they capture 99.75% of particles that have a size of 0.3 micrometers (μm) or larger in diameter. Arete can be used in a dedicated air purifier mode when you don’t need to dry the air. If you want to always have cleaner, fresher air in your home this filter will have to be replaced roughly every 3 months.