Trion Air Bear 255649-103 (4 Pack) Pleated Furnace Air Filter 20"x20"X5" MERV 8 MERV 8 filtration Nominal: 20 x 20 x 5 Actual: 20 11/16 x 19 3/4 x 5 Genuine Trion OEM filter Made in the USA This filter is not compatible with Lennox and Honeywell filter.