Nordic Pure 20x25x6 MERV 8 rated pleated air conditioning filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your workspace or office. 6” air filters are normally limited to commercial HVAC systems, so it would be uncommon for you to need one in your home. Each time air passes through a Nordic Pure pleated furnace filter, lint, dust, pollen, dust mites, mold spores, odors and other contaminants are removed. Our filter media prevents the growth of bacteria or mold, resulting in a healthier living space. MERV 8 air filters are comparable to air filters with the MPR rating of 600-800, FPR rating of Green, or APR rating of Gold. Particles in indoor air are measured in microns; for scale, a human hair is about 70 microns wide. Each MERV 8 filter captures up to 85% of airborne particles as small as 3.0-10.0 microns.