The Winix True HEPA + 4 Filter Activated Carbon Replacement filter includes a 99.97% True HEPA filter and 4 carbon pre-filters. The True HEPA filter catches dust, allergens, and other small particles while the Carbon pre-filter absorbs VOC (volatile organic chemicals).
Fits Winix air cleaner models 9000, 5000, 5300, and 5000B | 
