Product DescriptionThe Nordic Pure MERV 10 pleated allergen reduction electrostatic air filter will vastly improve the air quality in your home or business. With each pass through your MERV 10 pleated air filter, the air in your living space improves. This electrostatic air filter attracts and captures airborne dust, pollen, mold spores, pet dander, smog, dust mite debris, and baking flour. The MERV 10 pleated air filter is made of synthetic material that will not support the growth of mold and bacteria. Along with the reduction of dust on surfaces, this MERV 10 pleated air filter will attract and capture the small, allergy-aggravating micro-particles that can cause your family discomfort. This Nordic Pure allergen reduction pleated air filter has a Minimum Efficiency Reporting Value(MERV) of 10 which means that it will collect more than 85-percent of 3.0-10.0 microns of contaminants and up to 65-percent of particles 1.0-3.0 microns. Particles in indoor air are measured in microns, which are 1/1000 of a millimeter. A human hair is about 70 microns wide. This high performance air filter will outperform non-electrostatic fiberglass, washable, or disposable poly filters. Nordic Pure air filters have an actual size that is a fraction of an inch smaller than the nominal size. With the 4-Inch and 5-Inch air filters there is a wide variance between the nominal size and actual size. Almost ALL filters have a different actual size than the nominal size printed on the filter so it is best if you measure your filter for the EXACT size and compare it to our "Actual Size. This is why we ask you to measure your filter so you aren't surprised if the filter doesn't fit. Our MERV 10 four or five inch air filter should be changed at least every 6 months depending on your environment. Changing your air filter at the recommended time will help maintain a healthy environment as well as keeping your air conditioning and heating systems running efficiently.From the ManufacturerNordic Pure's air filters are pleated and electro statically charged and have a high efficiency rating. The electrostatic charge of the air filters works as a magnet and draw airborne particles to them. This helps protect your family from pollen, fine dust, tobacco and cooking smoke, airborne plant spores, bacteria and some viruses. Our non-woven synthetic filter media will not support the growth of mold or bacteria, keeping your home healthier. Air filters are ranked in a minimum efficiency rating value (MERV) system. The higher the MERV rating, the better the air filter can filter out all airborne particulates. Remember not all HVAC systems can handle the higher MERV ratings. Filters that have received a rating of MERV 7-12 are great for all HVAC systems. However, MERV ratings of 13-16 are able to remove and capture smaller particle sizes even before the air filter starts to become dirty and are recommended for newer units. We manufacture most any size disposable home air filter in 1/2-Inch 1-Inch, 2-Inch, 4-Inch, 5-Inch and 6-Inch thickness. The printed size on the side of your air filters may be the nominal size so it is best to physically measure your filters with a ruler or tape to get the EXACT measurements of your home air filters within 1/8 of an inch on the length and width. Consult your HVAC system's operating manual for information. Nordic Pure recommends that you replace your filters every 1 to 6 months. That way, our filters will help your HVAC system to continue running to its best capacity. Nordic Pure has been manufacturing air filters since 1960 at our plant in Oklahoma. We are proud to be offering a MADE IN THE USA product.