Nordic Pure 20x20x5L1M12-2 Lennox X0585 Replacement MERV 12 Pleated Furnace Air Filter, Box of 2 Actual Size of Filter: 19-5/8 x 19-7/8 x 4-3/8 Made in USA Replaces Lennox X6670 And X6672 Replaces Honeywell FC100A1029 and FC200E1029