Basic MPR300 Merv5 Dust And Lint Air Filter 20 By 24 By 1 Inch. OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. air filters for your furnace, air conditioner or HVAC system. DESIGNED WITH EXCLUSIVE Filtrete™ Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through. ATTRACTS AND CAPTURES large particles such as lint, household dust, dust mite debris and mold spores. MPR 300 has a rating of MERV 5. The higher the MPR, the more microparticles—such as pollen, pet dander, smoke, bacteria and viruses—your filter will capture from the air passing through it. CHANGE FILTER AT LEAST EVERY 90 DAYS for optimal performance of your heating & cooling system or HVAC system. A dirty filter will slow down air flow and make the system work harder to keep you warm or cool -- wasting energy. FOR RESIDENTIAL use only.