Tier1 Replacement for 3M 9x13x1 FAPF04 Ultra Slim Air Purifier Filter 4 Pack Fits into 3M Filtrete Ultra Slim Air Purifier FAP04-RC Cost-effective alternative to the discontinued OEM filter Actual Size: 8 inches (width) x 13 inches (height) x 3/4 inches (thickness) Merv 8 Replacement for the 3M Filtrete FAPF04 & FAPF04-4 Air Purifier Filters