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Duct filters remove contaminants from air flowing through central heating and cooling systems. They capture dust, pollen, and pet dander, making them beneficial for allergy sufferers. Filters need to be periodically changed or cleaned. Installation is usually simple and can use custom or standard filters.
A duct filter is a type of air filtering device commonly used with central heating and cooling systems in a residential or commercial building. The purpose of the duct filter is to remove various types of contaminants as the air flows through the filter body. Filters of this type are often found in the duct at a point known as the return, or the point where duct equipment pushes air in and out of the duct as part of the heating and cooling process. Most types of air or duct filters need to be changed periodically, although some models can be cleaned and used for longer periods of time.
One benefit of the duct filter is that the device is capable of capturing various types of air contaminants found in most homes and various types of public buildings. Even though the other components of the HVAC system are working to regulate the flow of warm or cool air into the interior space of the house, the filter is positioned so that the air passes through the porous body of the filter. As air passes through filter materials, which can include charcoal, pig hair and wire mesh, contaminants such as dust, pet dander and pollen are captured and collected on the duct filter surface.
People with allergies find that using a high-quality duct filter recommended by system manufacturers will go a long way in relieving the discomfort of exposure to high amounts of various irritants. Since the filter works with both warm and cold air, allergy sufferers can enjoy relative comfort indoors at any time of the year. While basic filters often work well with minor allergies, there are also heavy-duty filter models that are more efficient and capable of capturing greater amounts of airborne contaminants.
Installing a duct filter is usually a simple process. With many air conditioning systems, opening the cover on the return section of the ductwork allows you to slide the used filter out of position, then insert a new filter. Some manufacturers require that a custom-designed duct filter be used with their systems, while other systems may use standard filters found in hardware stores and other outlets where duct equipment and supplies are sold. Some brands of filters are built to allow homeowners to rinse contaminants from the body of the device, then repeatedly reuse the filter. More often than not, filters are intended for one-time use and are replaced several times a year, based on manufacturer recommendations.
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