Nordic Pure 20x25x5 Honeywell Replacement MERV 10 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 10 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 air filters are comparable to air filters with 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.