Nordic Pure 10x20x2 MERV 13 Plus Carbon Pleated AC Furnace Air Filters, 3 Pack "Purchased these for my PSI Woodworking Products DC725 tabletop air filtration unit. They fit fine and filter well enough so as to not restrict the intake of air and flow of sawdust. Easy enough to remove, tap out, vacuum and replace." The MERV 13 Plus Carbon air filter is a convenient pleated air conditioner furnace filter that has been impregnated with activated carbon and will help to eliminate unwanted pet and home odors as well as reduce the dust in your home or office. With each pass through the pleated filter, the air in your living environment improves. Our high efficiency activated carbon filter will absorb hold odors from smoke, pets, garbage, bathrooms, litter boxes and cooking in the millions of microscopic carbon pores. Odorous gases and vapors (VOC) are attracted to and held by the activated carbon material. The MERV 13 electrostatic filters help trap airborne particles to protect your family from pollen, household dust, mold spores, and dust mites. The Nordic Pure anti-microbial media will not permit the growth of bacteria or mold, therefore, making your breathing environment healthier. It can be installed in practically any HVAC system without modifications. The Nordic Pure anti-allergen pleated air filter has a Minimum Efficiency Reporting Value(MERV) of 13 which means that it will collect more than 90-Percent of 1.0-10.0 microns of contaminants, and up to 95-Percent of .30-1.0 microns of contaminants. The effectiveness of your air filter will depend on your environment. Nordic Pure recommends that you change the air filter every 30-60-90 days depending on the conditions in your home. Nominal Size: 10 x 20 x 2, Actual Size: 9 1/2 x 19 1/2 x 1 3/4 (9.5 x 19.5 x 1.75) Absorb smells from pets, smoking, cooking and other household odors Ideal for customers looking for superior filtration and odor control Nordic Pure recommends changing 2? air filters every 30-90 days Made in the USA