The US Environmental Protection Agency EPA considers …..µm the “most penetrating particle size”.

Approximately how many microns are the droplets of liquid when coughing or sneezing from an infected person?

Respiratory droplets may contain many virions.

How efficient is HEPA when tested with an MPPS-wide aerosol?

It is recommended to install HEPA filters at the outlets of ventilators used in the intensive care unit of people infected with SARS-CoV-2.

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