The 3M Filtrete Micro Allergen 18x30x1 air filter carries a Filtrete MPR (Microparticle Performance Rating) of 1000, which is equivalent to a MERV 11 rating. This 4-pack filter is engineered to capture microscopic particles such as pollen, pet dander, mold spores, dust mite debris, and smoke particles from household air, making it 25x more effective than standard fiberglass filters at trapping allergens.

3M recommends replacing the Filtrete Micro Allergen 18x30x1x1 filter every 90 days (3 months) under normal household conditions. With this 4-pack, you get a full year's supply of filters. Homes with pets, smokers, or high dust levels may need to replace the filter every 30–60 days to maintain optimal airflow and filtration performance in your HVAC system.

The 3M Filtrete Micro 18x30x1 filter has nominal dimensions of 18 x 30 x 1 inches, with actual dimensions of approximately 17.7 x 29.6 x 0.81 inches to allow for proper fitment inside standard HVAC return vents and furnace filter slots. Always verify your system's filter size before ordering to ensure compatibility.

Using 3M's proprietary Electrostatic technology, the Filtrete Micro Allergen 18x30x1 filter captures large airborne particles including lint, household dust, dust mite debris, pollen, mold spores, and pet dander. The electrostatically charged fibers attract and trap microparticles as small as 1–3 microns, helping improve indoor air quality for allergy and asthma sufferers.

No, the 3M Filtrete Micro 18x30x1 is designed with exclusive 3-in-1 technology that pulls in and traps particles while allowing cleaner air to flow through. Unlike denser HEPA-style filters, the Micro Allergen filter balances particle capture with airflow, making it compatible with most residential central heating and air conditioning systems without straining the blower motor.