6 pack of 12x24x4 merv 13 pleated 4" inch air filters by glasfloss. actual size: 11-3/8 x 23-3/8 x 3-3/4 ● filtration rating: merv 13. comparable to 3m/filtrete mpr rating 1900 to 2200, or fpr rating 10. ● protects from pollen, dirt, dust, pet dander and virus carriers, smoke, smog, lead dust, oil smoke and micro allergens. ● note: does not replace 5" inch or 4-3/8" depth filters. please check actual filter size needed.
