Please Note: Filtrete Advanced Allergen Reduction Filters are ONLY manufactured in the sizes listed below. If the filter size you require is not listed below we recommend using Filtrete Ultimate Allergen Reduction Filters.

MERV and 3M Performance Rating
MERV stands for Minimum Efficiency Reporting Value and is a number from 1 to 12, produced from a test designed by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). The MERV rating is intended to help people compare filters and a higher MERV rating indicates better filter performance. The 3M Filtrete Advanced Allergen Reduction Filter is rated MERV 12. 3M also produces ratings which focuses on a filter's performance at capturing the smallest airborne particles measured in the ASHRAE test. 3M uses particle data between 0.3 and 1 micron in size to calculate a Microparticle Performance Rating or MPR. The 3M Filtrete Advanced Allergen filter receives an MPR of 1500.