:Premium True HEPA Filter Replacement Compatible with Germ Guardian Air Purifier AC4100 Replaces Part FLT4100 Filter E  (2 PACKS) Pre-filter and true hepa filter captures 99.97% of allergens. 2 Filters included Charcoal filter helps reduce household odors Long-lasting filter needs to be replaced every 6-8 months Dimension 1.5 x 6.2 x 8.2 inches Not in color box retail packaging