Nominal: 20x25x2, size: 19 1/2"x24 1/2"x1 3/4" 20x25x2, ac furnace air filter comparable to 3m filtrete mpr 600 clean living comparable to honeywell micro defense plus fpr 8 fights lint, dust mites, mold spores, pollen, pet dander, and dust. change frequency 60-90 days, made in the usa.
