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Whole house air filtration units are installed between a furnace and the return air duct and are installed so they can capture airborne particles such as pollen, dust, spores, dander, bacteria and many other harmful particulates. Some air cleaners are non-electric media and others have a combined media and electric air filtration capability, the later being the best whole house air filter.
Performance of these air filters is measured in terms of how efficient they are at trapping micron-sized particles.
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