3M's best overall quality filter available. The construction quality is top of the line. The filtering efficiency is outstanding. The airflow is better than the Filtrete Micro Allergen from 3M. The Filtrete Ultra Allergen has our highest rating of 6 STARS. Please note that these Filtrete filters measure approximately 0.3 inches smaller than the stated size in order to conform with industry standards.
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3M's best overall quality filter
Meets the American Lung Association Health House program Indoor Air Quality Guidelines
Captures microscopic allergens like dust, smoke and smog particles
Captures large allergens like mold spores and pet dander