Our set of 2 microfiber 12" - 16" round fan filters, filter the air in your home every time you turn your fan on. The unique fiber of these filters helps to trap airborne dust, pollen, dirt, pet hair, smoke and odors. Not only will you breathe easier, but you will dust less often! Let your fan filter the air while airborne pollutants are trapped by the filter material. Slip on easy installation. Set of 2.