Filtrete 20x20x1, AC Furnace Air Filter, MPR 300, Clean Living Basic Dust, 6-Pack exact dimensions 19.69 x 19.69 x 0.81

Electrostatically charged fibers attracts and capture large airborne allergens like: Pollen, Household Dust, Lint Ideal for high-velocity heating and cooling systems 300 MPR Performance Rating Lasts up to 3 months The higher the MPR, the more microparticles - such as pollen, pet dander and smoke - your filter will capture from the air passing through it CHANGE FILTER AT LEAST EVERY 90 DAYS for optimal performance of your heating & cooling system or HVAC system A dirty filter will slow down air flow and make the system work harder to keep you warm or cool -- wasting energy. Sign-up for a filter change reminder program that works for you!