Edit: Another design we're considering based on an Army prototype: https://docs.google.com/document/d/1Hcuu-55q2a3_-LmBwg0uBdgM...
If you would like to help please join us at the #project-pneumatic-ventilator room of the Helpful Engineering Slack: https://helpfulengineering.slack.com/join/shared_invite/zt-c...