Filtrete Healthy Living Ultra Allergen Reduction AC Furnace Air Filter, Captures Fine Inhalable Particles, Delivers Cleaner Air Throughout Your Home, MPR 1500, 16 x 25 x 1, 2-Pack Helps promote a healthy home by reducing airborne dust, allergens, bacteria & viruses 4x better small bacteria and virus capture {Refers to bacteria and viruses that are less than 1 micron in size} Electrostatically charged to attract and capture microscopic airborne particles Carries a 1500 Microparticle Performance Rating (MPR) Lasts up to 3 months Designed with Filtrete Brand 3-in-1 technology from 3M to pull in and trap unwanted air particles while letting clean air flow through Captures microscopic particles including: smoke, cough/sneeze debris, bacteria, viruses, and large particles like lint, dust and pollen. Electrostatic air filter with Microparticle Performance Rating 1500 3 times better at small particle capture compared to non-electrostatic pleated filters for the capture of 0.3 to 1.0 micron particles.