Nominal: 20 x 24 x 4 size: 19 3/8"x23 3/8"x3 3/4" 20x24x4, ac furnace air filter standard capacity comparable to 3m filtrete mpr 600 clean living comparable to honeywell micro defense plus fpr 5 fights lint, dust, dust mites, mold spores, pollen, and pet dander.
