20x25x5 (19.88x24.88x4.38) MERV 8 Aftermarket White Rodgers Replacement Filter (2 Pack) Nominal size 20" x 25" x 5". Actual size 19 7/8" x 24 7/8" x 4 3/8". 98% efficient filtration media. High efficiency filter media collects small dust particles before they can collect on your coils. This is an aftermarket filter.