Filtrete Micro Allergen Defense MERV 11 Furnace Filter

This filter is effective at attracting and capturing large airborne allergens like pollen, mold spores and dust mites. The Filtrete Micro Allergen Reduction Filter carries a 3M Microparticle Performance Rating MPR of 1000 - roughly equivalent to a MERV 11 rating. Contains electrostatically charged media to filter and attract particles in the air. Attracts and captures microscopic allergens like: Smoke, Pet dander, Household dust and Smog. 3M Filtrete Air Filters meet the American Lung Association Health House Indoor Air Quality Guidelines. No unnecessary antimicrobial chemicals added; Filtrete filtering material will not support the growth of bacteria, mold, mildew or fungi in normal use. Nominal Size: 20" x 20" x 1". Actual Size: 19-3/4" x 19-3/4" x 7/8". Filter Change: Every 3 Months.