BestAir 18x24x1 MERV 8 Rated Pleated Air Filter. It effectively reduces up to 75% of large airborne particles, including bacteria, pollen, dust/lint, and mold spores. This filter is third-party certified to meet MERV 8 Rated standards, ensuring efficient removal of 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. It maintains efficiency for up to 90 days and is UL Classified.