Flanders PrecisionAire 84857.011418 NaturalAire Odor Eliminator Air Filter with Baking Soda, MERV 8, 14 x 18 x 1-Inch, 4-Pack Pack of 4 air filters designed with baking soda media to control, absorb, and 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 14" x 18"