NaturalAire Standard Air Filter, MERV 8, 20 x 30 x 1-Inch, 6-Pack Pack of 6 air filters designed for protection of furnace and central air units MERV 8 rating: Removes household dust, pollen, dirt, mold spores and more Pleated media provides large 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 30"