We LOVE Filters Filters are not just replacement parts, they are the air that our families breathe. Our AIRX FILTERS WICKED CLEAN AIR. air filters are made in the US at our factory and headquarters in Indiana, with great attention to quality. Industry Standard for Efficiency and Performance All of our AIRX FILTERS WICKED CLEAN AIR. filters are manufactured to perform based on the industry standard for filter efficiency by particle size and performance. National Air Filtration Association As a member of the National Air Filtration Association (NAFA) we are committed in manufacturing air filter products to maintain a clean and purified indoor environment through effective air filtration. Made in the USA AIRX FILTERS WICKED CLEAN AIR. air filters are made in Greenwood, Indiana with great attention to quality. TECHNICAL DETAILS Nominal Dimension 10x20x1 in Actual Dimension 9.50 x 19.50 x 0.75 in Model / MERV Rating Health / MERV 13 Pack Size 12-Pack Why is MERV Rating Important? MERV stands for Minimum Efficiency Reporting Value and is an industry standard to rate a filters efficacy. We recognize this is not very easy to understand for consumers, so we developed our simple to use application naming system. Simply pick the filter that suits your needs. Allergies, pets, odors and smoking all can greatly affect the quality of your indoor air. Discount Filters offers many different types of air filters to help you breathe easier and choose the correct filter based on your specific needs. Reduce your energy costs with clean filters A dirty filter in your HVAC system will raise your energy bills. A dirty filter restricts the air flow into your HVAC systems air handler, causing it to work harder to cool or heat your home. Improve airflow & efficiency of your furnace A dirty clogged filter can restrict HVAC airflow and potentially cause problems with the system. They also cease to filter allergens and other particulates out of your air. Increase the longevity of your HVAC system Dirty, unchanged filters can make your HVAC system fail completely. Repairing a broken HVAC system can end up costing you a pretty penny.