NaturalAire Odor Eliminator Air Filter with Activated Carbon, MERV 8, 20 x 20 x 1-Inch, 6-Pack Pack of 6 air filters designed with activation carbon technology to eliminate offensive odors MERV 8 rating: Removes household dust, pollen, dirt, mold spores and more V-pleats provide large media surface area for more effective filtration while keeping airflow resistance low Each filter maintains efficiency for up to 90 days Compatible with HVAC systems requiring filters sized 20" x 20"