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Filter Size: 18x25x1 | Actual Size: 17-1/2 x 24-1/2 x 7/8 | 1 Inch Depth Filter ● Filtration Rating: MERV 10. Similar to 3M Filtrete MPR rating 600 to 800, or Honeywell FPR rating 5 to 6. ● Captures and Attracts: Dust, Pet Dander, Smog, Lint, Pollen, Mold Spores and other micro particles. ● Air Flow: Comparable to MERV 8 with improved filtration. Durable & Long Lasting: Heavy duty frame won't buckle or support microbial growth. ● Made in the USA. For optimal performance, recommended to change at least every 3 months.