Atomic 16X20X1 Merv 8 Pleated Ac Furnace Filter - Case of 6 reduce pollen, dust, pet dander, and other fibers from air in your home decrease the airflow drag helping your system to operate more efficiently filters should be changed every 1 to 3 months MERV 8 air filters remove on average over 75-80% of the particles between 3.0 and 10.0 microns 100% high performance mechanical synthetic media