Nordic Pure 16x25x5 Honeywell Replacement MERV 14 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 14 filters are made of electrostatically charged synthetic materials that are ideal to reduce airborne contaminants in your workplace or office. Each time air passes through a Nordic Pure pleated furnace filter, airborne dust, pollen, mold spores, pet dander, smog, dust mite debris, smoke, and bacteria are captured and removed. MERV 14 air filters are comparable to a MPR rating of 2800, is above the FPR rating Blue, and the APR rating Diamond. Particles in indoor air are measured in microns; for scale, a human hair is about 70 microns wide. Each Nordic Pure 5' MERV 14 air filter will capture more than 90% of 1.0-10.0 micron contaminants and up to 85% of .30-1.0 micron contaminants. It is important to note that because of this high filtration and air flow restriction, HVAC systems should be rated to handle filters of MERV 14 and above, which are not typically used in residential settings. The effective life of your air filter depends on both the inside and outside conditions in which you live.