3M Filtrete FAPF03 Air Cleaning Filter Replacement Water Filters » 3M Filtrete Air Filters Systems 3M Filtrete FAPF03 is a Replacement Filter for:3M Filtrete FAP03-RS Ultra Clean Air Purifier 3M Filtrete FAPF03 Replacement Filter Specs:Filter Size: 21.44 in x 11.75 in x .75 in Filter Change: Every 3 Months Usually In Stock Your Price: $