Nordic Pure’s 16x25x3 MERV 14 Air Bear Cub Replacement filter is meant to replace the filter for any system that requires a 3” depth. Unlike other filters where the nominal and actual sizes differ by a fraction of an inch, the Air Bear Cub Replacement has a nominal and actual depth of 3 inches exactly. Keep that measurement in mind when you are measuring your filter’s housing to determine what filter is best for you. Nordic Pure 3” MERV 14 Air Bear Cub Replacement 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 3” 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 the inside and outside conditions in which you live. We recommend that you change your air filter every 3 to 6 months to maintain maximum efficiency and indoor air quality.