The 3M Filtrete Elite Allergen Home Air Filter is the most advanced high-performance home air filter made by 3M Filtrete. This Filtrete Allergen filter even outperforms Filtrete's own Ultimate Allergen Air Filter which was previously the number 1 performance air filter on the entire market. This 3M Filtrete air filter provides approximately 20% more air cleaning power than the Filtrete Ultra Allergen Reduction Filter and outperforms all other one inch three month home air filters of other brands and competitors.Also known as the Filtrete 2200 filter, this furnace filter boasts a 2200 Microparticle Performance Rating (MPR), which represents the effectiveness of a home air filter at capturing the smallest airborne particles measured in industry standard tests. Indoor levels of air pollutants can sometimes be higher than outdoor levels; as such, a Filtrete air filter can help to better clean and filter the air in your home by effectively reducing various particles and contaminants.