Flanders 84858.012025 NaturalAire Standard Air Filter MERV 8, 20 x 25, 1-inch, 12-Pack, 20" x 25" Pack of 12 quality 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 25"