You run a tight ship at home, from floor to ceiling -- and everywhere in between. Unfortunately, ordinary home non-electrostatic air filters arent 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. Type: Pleated Electrostatic Material: Synthetic Size: 14 In. x 30 In. x 1 In. Actual Size: 13.81 In. x 29.81 In. x 0.88 In. Rating: 300 MPR Life of Product: 3 mo