1000 Performance Rating, MERV 11 Rating. Convenient package of 4 filters. Up to 3 months of filtering performance. Up to 30 times more effective at capturing micro particles than ordinary fiberglass filters.
 

10x20x1 (9.7 x 19.7) Filtrete Allergen Defense 1000 Filter by 3M

This filter is 10x20x1 and measures 9.7x19.7x1. With a 1000 performance rating and a MERV 11 rating, this filter is up to 30 times more effective at capturing micro particles than ordinary fiberglass filters. Meeting the American Lung Associations Health House Project indoor air quality guidelines, it outperforms all competitors 3 month, 1 filters. This product captures airborne micro particles including smoke, airborne allergens, pollen, pet dander, mold and bacteria. It also captures large particles like dust and lint. This filter lasts up to 3 months and no unnecessary antimicrobial chemicals are added. Filtrete filtering material will not support the growth of bacteria, mold, mildew or fungi in normal use.