Photo 1 of Improvedhand 115115 HEPA Replacement Filter A Size 21 Compatible with Winix PlasmaWave Air Purifier C535 5300 5300-2 5500 5500-2 6300 6300-2 P300 AM90 9000 5000 C909 9800, True HEPA Filters

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Photo 1 of Improvedhand 115115 HEPA Replacement Filter A Size 21 Compatible with Winix PlasmaWave Air Purifier C535 5300 5300-2 5500 5500-2 6300 6300-2 P300 AM90 9000 5000 C909 9800, True HEPA FiltersPhoto 2 of Improvedhand 115115 HEPA Replacement Filter A Size 21 Compatible with Winix PlasmaWave Air Purifier C535 5300 5300-2 5500 5500-2 6300 6300-2 P300 AM90 9000 5000 C909 9800, True HEPA Filters