Nordic Pure 20x20x5 (4-3/8 Actual Depth) Honeywell Replacement MERV 8 Pleated AC Furnace Air Filter, Box of 4 Actual Size of Air Filter: 19 5/8 x 19 7/8 x 4 3/8 (19.63 x 19.88 x 4.38) inches All Nordic Pure air filters are electrostatically charged for maximum performance Attracts and captures dust, lint, pollen, bacteria, pet dander, dust mites and mold spores Replacement air filter for Honeywell FC100A1029 Made in the USA