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Changes to Step #9

Edit by Guy Kuo

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[title] Configuration for HALO Fan (PAPR)
[* green] 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] Prototype with 60 mm 2 watt tubaxial fan has limited air flow. To enhance airflow volume and routing, two expiratory valves or twin viral filters may be needed. You can optionally add short, corrugated inside halo to better route airflow and reduce fogging.
[* icon_caution] If two expiratory filtersvalves are used, verify your HALO maintains positive pressure even during inspiration.
[* icon_caution] If two expiratory filtersvalves are used, verify your HALO maintains positive pressure even during inspiration.
[* icon_note] I have successfully worn the single filter/60 mm fan configuration for several hours walking around my hospital, even rounding on patients. One can be mobile, but definitely cannot move fast due to CO2 clearance rate.
[* black] If weight of HALO and fan are uncomfortable attach a strap spanning top of halo.