Exact Size: 19 7/8 x 21 1/2 x 7/8 (19.875 x 21.5 x.875) Nominal Size: 19 7/8 x 21 1/2 x 1 Case of 12 Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6. 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. Economical high quality replacements for Carrier, Payne, or Bryant 19 7/8 x 21 1/2 x 1 air filters. Electrostatic air filter shields from dust, pollen, debris, pet dander, smog and other particles.