Nordic Pure 16x20x5 Honeywell Replacement MERV 8 rated air filters are what is considered the traditional 5” filter at an actual 4 3/8”. It can replace not only Honeywell but Lennox, Carrier, and Bryant filters. Of course, these are a list of the most well-known systems that use this size; always measure your filter housing to make sure the actual size correlates with the filter you are ordering. 5” Honeywell Replacement MERV 8 rated air filters are made of electrostatically charged synthetic materials that attract and capture most airborne particulates in your home. Each time air passes through a Nordic Pure pleated filter, lint, household dust, pollen, dust mites, mold spores and other contaminants are removed. Our treated synthetic filter media prevents the growth of bacteria or mold, resulting in a much 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 Nordic Pure 5” MERV 8 air filter captures up to 85% of airborne particles as small as 3.0-10.0 microns. The effective life of your air filter depends on both the inside and outside conditions in which you live. We recommend that you change your air filter every 30-90 days to maintain maximum efficiency and economy.