Can HEPA Air Filtration Stop Viruses?

Can HEPA Air Filtration Stop Viruses?
Are viruses too small to be captured by HEPA filtration? Some people say they are to small to get captured by a HEPA filter. Are viruses smaller than the mesh on a HEPA filter? The truth is, some HEPA filters can capture very small virus particles.
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[@will6699]

Thank you for getting it right that they are better below and above .3 microns. Most people get that wrong.