| [title] Design Principles
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| [* black] Use non-permeable, yet readily available barrier (plastic bag) as air tight hood protecting entire user head. |
| [* black] Provide protection against not only splash, but also highly dangerous aerosolized virus generated during airway manipulations. |
| [* black] Use positive pressure gradient rather than material perfection to exclude contaminated room air. |
| [* black] No tight fit requirement. |
| [* black] Unlike a completely 3D printed mask, does NOT rely on printing perfection to create safety barrier. |
| [* black] Preserve cleanliness of 3D parts inside PAPR to facilitate re-use and extended life.
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