Order 20x20x4 Furnace Filters With High MERV Rating For Dust Reduction In Your Home An apple a day can keep the doctor away! Well, so can regularly changing your furnace filters! Apart from improving air quality, it can also reduce your costs, so it's a win-win. United Filter Company offers you a range of custom furnace filters of any size available for a variety of furnaces, air conditioners, heat pumps, and HVAC systems. The filters trap contaminants and reduce dust, keeping your home clean, safe, and healthy. You can choose from cotton, wool, or synthetic filters that differ in terms of lifespan and performance. Among the products featured is the 20x20x4 replacement air filter, coming in cases containing 4-6 filters. You can choose to buy the 4-inch filter with MERV ratings ranging from 8 to 13, effectively protecting your home from dust, pollen, pet dander, and bacteria. The 20x20x4 furnace filter utilizes synthetic media, which provides added durability, and is suitable for both residential and commercial use. Visit https://unitedfilter.com for more.