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 and dust mite debris. MPR 300 has a rating of MERV 5.The higher the MPR, the more microparticles - such as pollen, pet dander and smoke - your filter will capture from the air passing through it.