Filtrete 20x30x1, AC Furnace Air Filter, MPR 1500, Healthy Living Ultra Allergen, 4-Pack exact dimensions 19.84 x 29.84 x 0.78Your home should be your sanctuary, starting with the air you breathe. Filtrete Allergen, Bacteria & Virus Air Filters help capture unwanted particles from your household air, contributing to a cleaner, fresher home environment. By proactively capturing dust, bacteria, viruses and allergens, these high performance filters help improve your homes air quality.OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. home air filters for your furnace, air conditioner or HVAC systemDESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow throughATTRACTS AND CAPTURES microscopic particles such as smoke, cough and sneeze debris, bacteria and viruses and large particles, including lint, household dust and pollen1500 MPR has a rating of MERV 12The higher the MPR, the more microparticles such as pollen, pet dander, smoke, bacteria and viruses your filter will capture from the air passing through it54% SMALL PARTICLE CAPTURE, like bacteria and particles that carry viruses % captured is based on ASHRAE 52.2 testing for 0.3 to 1 micron particles from the air passing through the filter, which relates to HVAC industry standard efficiency testingCERTIFIED as asthma & allergy friendly As outlined in report ASCR: 1246-01