| [title] Design Principals |
| [* black] Supply virus free breathing gas as clean O2 or filtered through standard ventilator circuit virus filter. |
| [* black] Use non-permeable, yet readily available barrier (plastic bag) as air tight hood protecting entire user head. |
| [* black] Use positive pressure gradient rather than material perfection to exclude contaminated room air. |
| [* black] Unlike a completely 3D printed mask, does NOT rely on printing perfection to create safety barrier. |
| [* black] Preserve cleanliness of 3D parts inside HALO to facilitate re-use and extended life.
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