There is finaly some secification what a emergency ventilation system MUST fulfill This is what makers MUST pay attention to.
There are official treatment recommendations from German “Deutsche Gesellschaft für Pneumologie”
Recommendations for the treatment of respiratory complications in case of a virus- pandemic
In case of a viral pandemic without availability of effective vaccination, one can expect to be faced with additional 250 to 300 new admissions per hospital per week given the worst case scenario. Major complications are expected to occur in the respiratory system with the focus on viral pneumonia often complicated by bacterial superinfection.
A lot of people engage in projects working on masks to protect themselves or others from COVID-19. There is lots of discussion about what kind of filtermaterial to use.
The filtermaterial you want to use might depend on the type of risk you want to minimise. If you want others to be protected from you coughing at them a different kind of mask might be sufficient than protecting you from inhaling virus.