I proposed a design on the slack group based on a centrifugal blower and airflow and pressure sensors.. I think this is the principle modern hospital ventilator

I proposed a design on the slack group based on a centrifugal blower and airflow and pressure sensors.. I think this is the principle modern hospital ventilators use. You do the logic and control system in C code rather than mechanical linkages and valves.. very few moving parts, and pcbs/pcb assembly are quick and cheap. just don't make any bugs..