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 traps 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. Type: Pleated Electrostatic Material: Synthetic Size: 18 In. x 24 In. x 1 In. Actual Size: Rating: 300 MPR Life of Product: 3 mo