Filtrete Ultimate Allergen high performance filters are 26% more efficient than the Advanced Allergen filter. It is effective at attracting and capturing 93% of large airborne allergens like pollen, mold spores, and dust mite debris. Electrostatically charged filters attract and capture microscopic airborne particles like smoke, pet dander, household dust, smog, bacteria, particles that can carry viruses, and particles that can carry tobacco odors. Includes a filter change reminder sticker. Lasts up to 3 months. MPR rating of 1900 performance rating. Blue label.