Actual Size: 9-1/2 x 9-1/2 x 7/8 Nominal Size: 10x10x1 Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR 5-6 rating. Blocks and Captures: Dust, pollen, mold spores, pet dander, smog, dust mites, debris. Durable & Long Lasting: Heavy duty frame won't buckle. Made in the USA.