18x18x1 MERV 8 Pleated AC Furnace Air Filters. 6 PACK 18x18x1 MERV 8 AC Furnace Air Filters. 6 PACK Protects from Lint, Dust, Pet Dander, Pollen, Dust Mites, & Mold Actual Size: 17-1/2 x 17-1/2 x 7/8. Filter Rating: MERV 8 | FPR 5 | MPR 600. Pleat consistency maximizes performance Made in the USA