Filtrete BA20-4 Air Filter, 12 in L, 24 in W, 5 MERV, 300 MPR (Pack of 4)

You run a tight ship at home, from floor to ceiling and everywhere in between. Unfortunately, ordinary home non-electrostatic air filters aren't super effective at capturing unwanted particles. Good News: The unique design of the electrostatically charged Filtrete™ basic dust air filter attracts and trap more particles from your air through your heating and cooling system, making quality control a breeze. With each cycle through the filter, your indoor air becomes a little bit cleaner. Online purchases are in packages of 4.