20x24x4 MERV 8 AC Furnace 4" Inch Air Filters. Box of 2.  (Actual Size: 19-3/8" x 23-3/8" x 3-3/4") ACTUAL SIZE: 19-3/8 x 23-3/8 x 3-3/4 | 4" Inch Depth Air Filter 20x24x4 AC Furnace Air Filters MERV 8. Qty 2. Extremely low pressure drop and high dust holding capacity Engineered and designed for high strength and rigidity Made in the USA