It is important that you select a replacement furnace air filter that fits your unit’s filter cabinet correctly, or else you will have airflow obstructions, hindering the performance of your HVAC system. Sizes of Furnace Air Filtersįurnace air filters come in different sizes. As the ratings of the air filters increase, so do the prices, but the extra cost is worth it to keep your home healthy and comfortable. The filters in this range are the ultimate protection against dust, pollen, mold, bacteria, viruses and the smaller airborne particles that often make breathing difficult for people with advanced sensitivities to poor air quality or weakened immune systems. These filters are the highest quality home filters available other than HEPA filters, making them great for those who are often afflicted by allergies and respiratory issues. The MERV 9-12 filters will also extend the life of the HVAC system by keeping the unit clean and free of debris and dust build-up. This is a great choice for those who have mild to moderate allergies or other respiratory ailments. A MERV 9-12 filter will remove pet dander, auto emissions and other smaller airborne particles from the air, creating a cleaner air supply. These filters catch the smaller particles such as those known to cause allergies. These filters have a 20-35% dust spot efficiency and offer higher air filtration than lower rated filters while remaining budget friendly. Here, the air filter is able to also remove mold spores and dust from the air. These filters are a step up from the MERV 1-4 air filters. With <20% dust spot efficiency, these filters are the best option where budget is a concern and health issues are minimal. They remove pollen, dust mites, and other harmful fibers. These filters offer a minimum amount of protection as they are primarily designed to assist the cleanliness of the HVAC units by filtering out particles that can damage the coils and harm the efficiency of the unit. The higher the number, the more efficient it is at removing contaminants from your air. Filters are rated by MERV (minimum efficiency reporting valve). In addition to styles, furnace air filters have different ratings. Even though they are excellent at eliminating indoor pollutants and create a healthier environment in your home, they can drastically reduce your system’s airflow, costing more money in energy usage. High efficiency particulate air, or HEPA, filters provide high-end filtration by trapping up to 99% of particles 0.3 microns or larger. They eliminate more pollutants from your air without sacrificing airflow within your system. Pleated filters are more efficient and last longer compared to fiberglass/synthetic filters. Pleated FiltersĪ pleated filter offers high-efficiency results by trapping particulates 0.3 micron in size, such as bacteria and viruses. If you install it before it completely dries, you run the risk of mildew and mold growth. Maintenance on a washable filter requires soap and water to wash the filter and letting it completely dry before reinstalling it. Washable versions offer a MERV rating between 4 and 10 and last considerably longer than the average filter. You can purchase disposable or washable electrostatic filters depending on the requirements of your furnace. Electrostatic FiltersĮlectrostatic filters use self-charging fibers to attract particles out of your air. A polyester filter costs fours time more than the average fiberglass/synthetic filter, but it offers more protection against pollutants that cause health issues. They trap and eliminate 80% to 95% of particles 5 microns or larger. Polyester filters are made using the highest quality materials available and are median-sized. They allow your system to have maximum airflow but don’t filter harmful contaminants affecting your health. The larger particles are trapped and eliminated, so your furnace components remain clean. ![]() Considered minimum protection, fiberglass/synthetic filters prevent dust and dirt from building up on heat exchangers, fan motors, and other surfaces. They catch up to 80% of particles 50 microns and larger and 25% of particles between 3 to 10 microns. The main types and their advantages are: Fiberglass/Synthetic Filtersįiberglass or synthetic filters are a cheap and disposable option for your furnace. There are a few different options to choose from when it comes to selecting a furnace air filter for your system.
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