SpiroPure 20X21X4 MERV 8 Pleated Air Filters - Made in USA (6 Pack)

20x21x4 ACTUAL: The actual size of this replacement filter is 20" x 21" 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.