Nordic Pure 10 in. x 20 in. x 1 in. pleated air filters are manufactured using a heavy-duty, moisture resistant beverage board frame. Reinforced with a metal mesh support grid that is bonded to the pleats for extra support. The non-woven, hypoallergenic and antimicrobial, synthetic MERV rated media will not support growth of mold or bacteria. Nordic Pure air filters use an electrostatically charged media that acts like a magnet to help dust cling to the air filter. This helps protect your HVAC unit, home, and family. Important Note: Most AC Furnace Air Filters have an actual size that is a fraction of an inch smaller than the standard size (also known as \'nominal sİze\") that is printed on your air filter. This may not be the Actual Size. Please measure your current filter and compare the dimensions to the actual product dimensions, listed in the Specifications section below, to ensure you order the correct filter.