The Nordic Pure MERV 12 4-inch Pleated Furnace Filters are expertly designed to enhance your indoor air quality. With a size of 16x25x4 inches, these filters feature a MERV 12 rating and are made from electrostatically charged media that effectively captures airborne particles. Ideal for use in HVAC systems, each filter comes in a convenient 1-Pack, ensuring you have the right solution for cleaner air in your home.