The Filtrete Ultimate Allergen Filter is one of the newest and most advanced high-performance home air filters from Filtrete. No competitor's allergy furnace filter performs better! This 3M Filtrete air filter even outperforms Filtrete's own Advanced Allergen previously the No. 1 performance filter on the market. This allergy air filter provides 25% more air cleaning power than the Filtrete Ultra Allergen Reduction Filter.This Filtrete air filter boasts a 1900 Microparticle Performance Rating (MPR), which represents the effectiveness of a filter at capturing the smallest airborne particles measured in the industry standard test. This Deep Blue filter lasts 3 months and meets the American Lung Association Health House Indoor Air Quality Guidelines.