20x20x4 MERV 11 ( MPR 1000 ) AC Furnace 4" Inch Air Filters. Qty 2.  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 MERV 11 AC Furnace Air Filters. 2 Pack Filter Rating: MERV 11 | FPR 7 | MPR 1000. Removes airborne particles that can alleviate allergies Made in the USA