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While they cost more, HEPA filters provide the ultimate protection against airborne particles.īesides filtering particulates, many cabin air filters are chemically treated with activated carbon that gives them a gray appearance and helps remove a wide variety of odors. One major supplier claims their premium HEPA cabin air filters have a filtration efficiency of 99.97 percent at 0.3 microns based on standardized industry testing. High Efficiency Particulate Air (HEPA) cabin air filters can trap even finer particles. This includes the majority of contaminants, but not the smallest particles of mold, spores, soot and tobacco smoke. Standard cabin air filters are typically around 98 percent efficient at trapping particulates in the 5-100 micron range. A basic filter may cost $15 at a local auto parts store while a premium original equipment part may be $50 or more when purchased from a car dealer. As the quality of a cabin air filter increases, so does its price.
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Not all cabin air filters are created equal.
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Quality filters may have several layers that support the filtering medium and offer different types and degrees of filtration. The filter's physical characteristics trap most contaminants and in many designs, the passage of air over the filter creates an electrostatic charge that helps attract and trap smaller particles. Most cabin air filters have a pleated filtering medium that looks like paper, but is actually a more complex material made of natural and/or synthetic fibers.
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