3 pack of 18x18x2 merv 11 pleated 2" inch air filters by glasfloss. actual size: 17-1/2 x 17-1/2 x 1-3/4 ● filtration rating: merv 11. comparable to 3m/filtrete mpr rating 1000 to 1200, or honeywell fpr rating 7. ● effectively reduces pollen, dust, pet dander, mold spores, dust mites, bacteria, smoke, smog and other allergens from the air in your home or business. ●
