The 3M Filtrete Micro Allergen 20x30x1 air filter has a Microparticle Performance Rating (MPR) of 1000, which is equivalent to a MERV 11 rating. This allows the filter to capture microscopic particles such as pollen, pet dander, dust mite debris, mold spores, smoke, and smog particles as small as 1 micron, making it ideal for households with allergy sufferers.

3M recommends replacing the Filtrete Micro Allergen 20x30x1x1 filter every 90 days (3 months) for optimal performance. However, homes with pets, smokers, or high dust levels may need to replace it every 60 days. This 4-pack provides a full year of filtration, making it convenient to stay on schedule and maintain healthy indoor air quality.

The 3M Filtrete Micro filter has nominal dimensions of 20x30x1 inches, with actual dimensions of 19.6" x 29.6" x 0.81". Always confirm your HVAC system requires a 20x30x1 filter before ordering. This 4-pack includes four individually wrapped filters to keep them clean until installation.

Using 3M's exclusive electrostatically charged filtration media, the Filtrete Micro Allergen 1000 MPR filter attracts and captures large particles like lint, dust, and pollen, as well as microscopic allergens including pet dander, mold spores, dust mite debris, smoke, and smog. It is specifically engineered to help reduce airborne allergens in your home's HVAC system.

The Filtrete Micro 20x30x1 filter fits standard residential forced-air HVAC systems, furnaces, and air conditioners that require a 20x30x1 inch filter. It features a pleated design with a sturdy paperboard frame for easy installation. Check the airflow arrow on the frame and install with the arrow pointing toward the furnace or air handler for proper performance.