This Costco value pack includes three 3M Filtrete 20x20x1-inch furnace and air conditioner filters rated at MPR 2200, designed for whole-home HVAC systems. The Micro-Particle Performance Rating (MPR) of 2200 places these filters in 3M's highest 1-inch filter tier, capable of capturing microscopic particles that standard filters miss.

Each filter uses electrostatically charged fibers to attract and capture airborne particles including large particles like lint, dust, and pet dander as well as fine particles like smoke, smog, and bacteria. At MPR 2200, the filters are effective against virus-carrying particles, exhaust particles, and ultrafine debris as small as 0.3 microns. This makes them well-suited for households with allergy sufferers, pets, or anyone concerned about indoor air quality.

The 20x20x1-inch nominal size fits a wide range of standard residential HVAC systems, furnaces, and central air units. 3M recommends replacing Filtrete filters every 90 days under normal use, though heavily polluted environments or homes with multiple pets may require more frequent changes. Buying a 3-pack provides a convenient supply for approximately nine months of coverage.