6 pack of 22x22x1 merv 13 pleated air filters by glasfloss. actual size: 21-1/2 x 21-1/2 x 7/8 ● 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. ●
