2 Pack of 18x24x4 MERV 11 Pleated 4" Inch Air Filters by Glasfloss. Actual Size: 17-1/2 x 23-1/2 x 3-3/4

2 Pack of 18x24x4 MERV 11 Pleated 4" Inch Air Filters by Glasfloss. Actual Size: 17-1/2 x 23-1/2 x 3-3/4 ● Filtration Rating: MERV 11. Comparable to 3M/Filtrete MPR rating 1000 to 1200, or 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. ● Note: Does not replace 5" inch or 4-3/8" Depth filters. Please check actual filter size needed.