This air filter set by Nordic Pure is perfect for anyone looking to improve the indoor air quality of their home or workplace. The set includes two high-quality MERV 12 filters with a nominal width of 20 inches and nominal height of 20 inches. Each filter is made of electrostatically charged synthetic pleated media that captures all kinds of contaminants, from allergens and bacteria to smoke and mold. The filters are humidity, ozone, moisture, mold, and tear resistant, making them durable and long-lasting. They fit perfectly in Lennox and Honeywell air filter frames, ensuring optimal performance.