The Brondell O2+ Horizon Air Filter Replacement is a composite filter that combines four filtration layers. The Pre-filter and True HEPA layers capture particles while the Granulated Carbon and Cold Catalyst layers filter VOCs and other harmful gases. The single 4-in-1 filter makes the filter replacement quick and easy. This replacement filter is for use with Brondell O2+ Horizon Air Purifier (P200 only.)

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