Dust & Pollen Plus, 25" x 25" x 1", Light Blue, Filtrete Filter, Captures Large Allergens Like Mold Spores & Pet Dander, 20 Times More Effective Than Ordinary Fiberglass Filters, Electrostaically Charged Filtrete Fibers Capture More Micro Particles, Meets The Guidelines Of The American Lung Association Health House Program, MPR Rating 600, Lasts Up To 3 Months.