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The Winix Replacement Carbon Filter 4-Pack (115119) includes 4 carbon pre-filters for a full year’s worth of carbon filtration in your Winix air purifier. These filters are ideally used with Winix Washable HEPA Filters (115122), which are sold separately. These 4 filters are all sanitized with an antimicrobial finish to provide extra freshness. The genuine Winix Filter Pack P is compatible with Winix Air Purifier unit 5500.