Utilizing electrostatically charged, 100% synthetic Kimberly Clark media which offers significantly higher particulate efficiency compared to regular poly/cotton media pleated filters, with little change in static pressure, the Tier1 MERV 13 Air Filters offer superior quality! Perfect for allergy sufferers, these pleated air filter panels capture airborne particles/allergens smaller than 1 micron in size, such as particles that carry viruses and bacteria, pollen, mold spores, fine dust and pet dander. MERV 13 filter media will not promote the growth of bacteria, mold, mildew, or fungi in normal operating environments, and has not been chemically treated. Tier1 Pleated MERV 13 Filters are a great upgrade from standard disposable panel filters. They are over 30 times more efficient at capturing microparticles than ordinary fiberglass air filters. Each air filter lasts up to 3 months depending on your air quality! The Tier1 MERV 13 filters are comparable to the 3M Filtrete Ultimate Allergen Series. The Tier1 Air Filters provide equipment protection. These air filters are environmentally friendly because the media is free of ink, dyes, resin, and contains no adhesives, binders, chemicals or additives. Use of water based adhesives containing no volatile organic compounds (VOCs), and minimum use of ink on the perimeter of the filter, make these air filters eco-friendly. This product is listed and rated by Underwriters Laboratories as U.L. Class 2. 6-pack of air filters.