3M high performance filter with a 1500 MPR (Microparticle Performance Rating) outperforms non-electrostatic filters. Rated for 90-day airflow performance. Filters out pollen, household dust, lint, dust mite debris, mold spores, smoke, pet dander, smog, bacteria and particles that can carry diseases. physical dimensions are 14 x 20 x 1 For more information visit www.Filtrete.com3M