The Nordic Pure 14x30x1 Pleated MERV 12 Air Filters come in a pack of 4 and are made in the United States. These electrostatically charged synthetic pleated filters are designed to capture a variety of contaminants including allergens, bacteria, dust mites, mold, pet dander, smoke, and viruses. With a nominal width of 14 inches, nominal height of 30 inches, and nominal depth of 1 inch, these air filters are suitable for indoor air quality improvement in residential spaces.