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Changes to Step #9

Edit by Guy Kuo

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[title] Configuration for Full PAPR
[* black] A fan draws room air through an anesthesia viral filter to fill the halo bag. Full mobility is possible with a 12 volt battery pack
[* black] However, fan power is limited and steps are needed to enhance airflow volume and routing. Two expiratory valves are a must. You may also need to add corrugated tubing to the halo to better route expirations and reduce fogging.
[* black] A higher power, blower fan is a reasonable upgrade to the design.

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