Actual Size: 21 1/2 x 23 5/16 x 7/8 (21.5 x 23.3125 x.875) Nominal Size: 21 1/2 x 23 5/16 x 1 Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or Honeywell FPR rating 5 to 6. Shields from Dust, Pet Dander, Smog, Lint, Pollen and other small particles. Improved MERV 10 Filtration with similar air flow and resistance as a MERV 8 filter. Durable & Long Lasting: Heavy duty frame won't buckle or support growth. Affordable high quality replacements for Bryant 21 1/2 x 23 5/16 x 1 air filters.