This replacement AC air filter features a MERV 10 rating that traps 95% of airborne particles including pollen, dust, pet dander, mold spores, dust mites, and other allergens. Designed for use with Honeywell 20" x 25" F100 and F200 Air Cleaners, compatible size air ducts, and can also be used as an Aprilaire 2200 filter. Filter should be replaced once a year for maximum efficiency.