18x25x1 Merv 8 Pleated AC Furnace Air Filters. Box of 6 18x25x1 AC Furnace Air Filter MERV 8. Box of 6 Protects from Lint, Dust, Pet Dander, Pollen, Dust Mites, & Mold Actual Size: 17-1/2 x 24-1/2 x 3/4. Filter Rating: MERV 8 | FPR 5 | MPR 600. Pleat consistency maximizes performance Made in the USA