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| [* black] The ''Halo'' can be configured for three types of virus-free air. |
| [* red] '''Oxygen / Compressed breathable air''' via small diameter O2 tubing is simplest option. Flow should be 10L/min. |
| [* orange] '''Filtered PAPR''' uses anesthesia viral filter and fan to provide clean air. 12 volt battery pack or AC adapter provides power. |
| [* light_blue] '''External Air''' via 22 mm connectors for connection of an external fan driven, filtered air source such as a Bair Hugger. |
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