Spiropure 9x20x4 merv 8 pleated air filters - made in usa (6 pack)

9x20x4 actual: the actual size of this replacement filter is 9" x 20" x 3.63" merv 8 rating: with an efficiency of 70% to 85%, these filters are usually the best option for most residential homes & light commercial units, ensuring airflow in your hvac system is unrestricted. filters allergens: removes potential allergens such as dust, lint, dust mite debris, pollen, mold spores, and pet dander. quality replacement: comparable to a 3m filtrete mpr rating of 300-600 (clean living and basic models). made in usa: our pleated furnace filters are made in the usa and offer a high quality replacement air filter option for your air conditioner and/or furnace unit without the high cost.