Filtrete 9817DC Washable Air Filter, 18 in L, 18 in W, 11 MERV, 90 % Filter Efficiency, Cardboard Fr

Filtrete Allergen defense air filters help reduce allergens in your air by turning your central heating and cooling system into a whole house air cleaner. Developed to pull in and trap unwanted particles such as pollen and pet dander from the air, these filters help capture allergens as well as large particles like lint and household dust.