Microparticle Performance Rating of 1,000 * Captures large airborne allergens like household dust, pollen, and mold spores * Attracts and captures microscopic allergens like pet dander, smoke, and smog particles Attracts and captures microscopic allergens like pet dander, smoke, and smog particles * Outperforms non-electrostatic filters, Lasts up to 3 months * Keeps your furnace or air conditioner running efficiently, Pack of 6 filters