NaturalAire Pre-Pleat 40 Air Filter, MERV 8, 10 x 10 x 1-Inch, 12-Pack Pack of 12 non-woven synthetic media air filters designed for the highest dust holding capacity and lowest pressure drop 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 10" x 10" x 1"