6 Pack of 18x24x4 MERV 10 Pleated 4" Inch Air Filters by Glasfloss. Actual Size: 17-1/2 x 23-1/2 x 3-3/4 ● Filtration Rating: MERV 10. Comparable to 3M/Filtrete MPR rating 600 to 800, or FPR rating 5 to 6. ● Protects from Lint, Dust, Pet Dander, Pollen, Dust Mites, Smog, & Mold ● Note: Does not replace 5" inch or 4-3/8" Depth filters. Please check actual filter size needed.
