12 pack of 18x20x2 merv 13 pleated 2" inch air filters by glasfloss. actual size: 17-1/2 x 19-1/2 x 1-3/4 ● filtration rating: merv 13. comparable to 3m/filtrete mpr rating 1900 to 2200, or honeywell fpr rating 10. ● protects from pollen, dirt, dust, pet dander and virus carriers, smoke, smog, lead dust, oil smoke and micro allergens. ●
