Nordic Pure 20x20x4/20x20x5 (19 5/8 x 19 7/8 x 4 3/8) Honeywell FC100A1011 Replacement Pleated AC Furnace Air Filters MERV 12, Box of 2 The Actual Size : 19 5/8 x 19 7/8 x 4 3/8 of a filter is fraction of an inch smaller than the nominal size Superior Air Filter for Residential or Commercial Property Comparable to a MPR rating of 1500-2002 Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the USA