A high efficiency particulate air (HEPA) filter is the top of the line in air filtration and removes more than 99% of particles that are 0.3 microns or larger in size. However, because of the dense filtration material used in HEPA filters, the air pressure needed to force air through the filter is too great for a furnace or air conditioning fan to handle. A HEPA filter installed in a furnace would restrict the air flow to the point that no air would come out of your vents. However, traditional air filters in the higher range of the MERV ratings (12-13) come close to the levels of HEPA filtration, with the exception of virus removal.
If you need or desire the ultimate contaminant removal that HEPA filtration offers, we recommend installing a separate air filter in your home that utilizes HEPA filtration. This will keep your furnace functioning efficiently and guarantee superior quality in your household air.
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