Nordic Pure 16x25x5 Goodman Replacement MERV 10 air filters are unique because of the actual size of the filter compared to the nominal size. Typically, a 5” filter is actually a fraction of an inch smaller, while these filters are larger at 5 1/4”. Other commonly known systems that use this filter size are Amana, Five Seasons, and Totaline. Please note that these name brands are not a comprehensive list; you may have a different system with the same measurements, so always measure your filter’s housing to ensure you order the proper fit. The 5” Goodman Replacement MERV 10 rated pleated AC air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home or office. Each time air passes through a Nordic Pure pleated furnace filter, lint, household dust, pollen, dust mites, pet dander, baking flour, mold spores and other contaminants are removed. MERV 10 ac filters are comparable the MPR rating of 800-1000, FPR rating between Green and Red, and APR rating between Gold and Platinum. Particles in indoor air are measured in microns; for scale, a human hair is about 70 microns wide. Each Nordic Pure 5” MERV 10 air filter will capture more than 85% of 3.0-10.0 micron contaminants and up to 65% of 1.0-3.0 micron contaminants. The effective life of your air filter depends on both the inside and outside conditions in which you live and work. We recommend that you change your air filter every 3-6 months to maintain maximum efficiency and indoor air quality.