Filtrete - Allergen Defense 18 in. W X 20 in. H X 1 in. D Polypropylene 11 MERV Pleated Air Filter 1 p

Formulated for homes concerned about airborne allergens, this pleated filter is built to work in standard HVAC systems while targeting smaller particles that basic filters often miss. Its electrostatically charged polypropylene media carries a 1000 MPR and MERV 11 rating, enabling it to capture many microparticles such as pet dander, smoke, smog, and fine dust, alongside larger debris, including lint, pollen, mold spores, and household dust.