20x20x4 MERV 8 AC Furnace 4" Inch Air Filters. 2 PACK.  Actual Size: 19-1/2" x 19-1/2" x 3-3/4" ACTUAL SIZE: 19-1/2 x 19-1/2 x 3-3/4 | 4" Inch Depth Air Filter 20x20x4 AC Furnace Air Filter MERV 8 - 2 Pack Protects from Lint, Dust, Pet Dander, Pollen, Dust Mites, & Mold Extremely low pressure drop and high dust holding capacity Made in the USA