Replacement filter set compatible with Winix Filter A 115115. Engineered to fit Winix Plasmawave Series Air Purifiers including 6300, P300, 5300, 5500, 5300-2, 6300-2 and C535. Filtration removes up to 99.97 percent of airborne particles as small as 0.3 microns in size including dust, pollen, smoke, pet hair and dander, mold spores and dust mites. Carbon pre-filter extends life of filter and reduces household odors from cooking, cleaning, pets and smoking. Recommended to replace filter every twelve (12) months and carbon pre-filter every three (3) months for maximum efficiency, or more often in harsh environments. Package contains a 1 year supply of filters: One (1) filter and four (4) carbon pre-filters. Filter-Monster branded replacement filter combo compatible with Winix Filter A 115115. Winix 115115 replacement filter A is engineered to fit Winix Plasmawave Series Home Air Cleaner Purifier models 6300, P300, 5300, 5500, 5300-2, 6300-2, and C535. Recommended to replace filter every twelve (12) months and carbon pre-filters every three (3) months for maximum efficiency. Package contains a one-year supply of filters: One (1) filter and four (4) carbon pre-filters.