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Filter Size: 18x20x1 | Actual Size: 17-1/2 x 19-1/2 x 7/8 | 1 Inch Depth Filter ● Filtration Rating: MERV 11. Similar to 3M Filtrete MPR rating 1000 - 1200, or Honeywell FPR rating 7. ● Captures and Attracts: Allergens, Dust, Pet Dander, Smoke, Smog, Bacteria, Lint, Pollen, Mold Spores and other micro particles. ● Durable & Long Lasting: Heavy Duty Frame won't buckle or support microbial growth. Suitable for residential or commercial use. ● Made in the USA. For optimal performance, recommended to change at least every 3 months.