6 Pack of 18x20x1 MERV 11 Pleated Air Filters by Glasfloss. Actual Size: 17-1/2 x 19-1/2 x 7/8 ● 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. ●
