Nordic Pure 20x25x5L1M12-2 Lennox X6673 Replacement MERV 12 Pleated Furnace Air Filter, Box of 2 Actual Size of Filter: 19-7/8 x 24-7/8 x 4-3/8 Made in USA Replaces Lennox X0585 And X7935 Replaces Honeywell FC100A1011 and FC35A1019