Features:

• Compare to our other filter offerings. Next to Availability, click on "from Filtera". On the next page, click on "Filtera Storefront." Add our storefront page to your Favorites.
• 3M's next 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

Editor Reviews:

Product Description:
3M's next 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 5 STARS. Please note that these Filtrete filters measure approximately 0.3 inches smaller than the stated size in order to conform with industry standards.

Rating : - Works
No problems using it. While the filter is more restrictive, it seems to compensate by having more pleats (larger area).