BestAir 20"x24"x1 MERV 8 Rated 90-Day Pleated Air Filter. It effectively reduces up to 75% of large airborne particles, including bacteria, pollen, dust/lint, and mold spores. This MERV 8 Rated rating means it is third-party certified to effectively reduce common indoor air pollutants such as household dust, pollen, dander, and lint. The clay-coated filter frame and wire backing provide durability throughout the filter's life. Maintains efficiency for up to 90 days. UL Classified.