Suggested Retail: $39.99. 4 Pack 115115 HEPA Replacement Filter Size 21 Compatible with Winix PlasmaWave Air Purifier - This package includes 4 x 115115 True HEPA Filters, perfect for protecting your and your pet's health with True HEPA filtration. These filters are made of high quality non-woven fabric with advanced technology for maximum filtration. They are compatible with Winix PlasmaWave Air Purifier models C535, 5300-2, 6300-2, 5300, 6300, 9000, 5000, 5000B, C909, 9800, AM80, AM90, P300. To maintain optimal performance, replace the filter every 6-8 months. Model: C535 -- LOT STICKER: TCE-BOX-PALLETCEB39-ITEM-46515a8b___LPNPMCQ0057809 4 Pack 115115 HEPA Replacement Filter A Size 21 Compatible with Winix PlasmaWave Air Purifier C535 5300 53002 6300 63002 P300 AM90 9000 5000 5000B C909 9800 -- SIZES ARE ESTIMATED. 7 CALENDAR DAY FULL REFUND GUARANTEE (FROM PRIMARY PICKUP DATE) ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE (FROM PRIMARY PICKUP DATE) IS ALSO AVAILABLE. THE PRIMARY PICKUP DATE IS THE DAY AFTER THE AUCTION ENDS. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.