Nordic Pure 20x20x5L1M12-1 Lennox X0585 Replacement MERV 12 Pleated Furnace Air Filter, Box of 1 Actual Size: 19 5/8x 19 7/8 x 4 3/8 Superior Air Filter for Residential or Commercial Property Comparable to a MPR rating of 1500-1994 Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the USA