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The pre filter is outside of the HEPA filter to protect the unit and extend the life of the main filter. These specialized filters offer unparalleled performance Austin Air Purifiers are recommended for not only those with chemical sensitivities, allergies and asthma, but children and adults alike who want a better quality of living and breathing. The replacement filter comes with a pre filter option in white or black. We recommend the white pre filter option for the Baby's Breath unit in pink and blue.
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