Nominal: 20 x 24 x 4 size: 19 3/8"x23 3/8"x3 3/4" 20x24x4, ac furnace air filter high capacity comparable to 3m filtrete mpr 1000 to 1200 micro allergen defense comparable to honeywell allergen plus fpr 7 fights lint, dust, dust mites, mold spores, pollen, pet dander, and smoke.
