Actual Size: 16 3/8 x 21 1/2 x 7/8 (16.375 x 21.5 x.875) Nominal Size: 16 3/8 x 21 1/2 x 1 Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or 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 Carrier, Payne, or Bryant 16 3/8 x 21 1/2 x 7/8 air filters.