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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 6051 mm 2 watt tubaxialblower 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 foggingwith 200 pascal static pressure is about ideal. 150 pascal static pressure capacity is probable minimum that allows unencumbered activity.
[* icon_caution] If two expiratory valves are used,Always verify your HALO maintains positive pressure even during inspiration.
[* icon_note] I have successfully worn thea lower performance single filter/60 mm tubaxial fan configuration for several hours walkinghours. Walked around my hospital,hospital and even roundingrounded on patients. One can be mobile, but definitely cannot move fast due to CO2 clearance raterate with lower performance fan.
[* icon_note] 51 mm blower fan provides much better air clearance and permits brisk walk and stair climbing. Results were so positive with 51 mm blower fan that halo now has integrated mount for the fan.
[* black] If weight 200 gm mass of HALO and fan are uncomfortable attach a strap spanning top of halo.
[* black] Prototype with 6051 mm 2 watt tubaxialblower 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 foggingwith 200 pascal static pressure is about ideal. 150 pascal static pressure capacity is probable minimum that allows unencumbered activity.
[* icon_caution] If two expiratory valves are used,Always verify your HALO maintains positive pressure even during inspiration.
[* icon_note] I have successfully worn thea lower performance single filter/60 mm tubaxial fan configuration for several hours walkinghours. Walked around my hospital,hospital and even roundingrounded on patients. One can be mobile, but definitely cannot move fast due to CO2 clearance raterate with lower performance fan.
[* icon_note] 51 mm blower fan provides much better air clearance and permits brisk walk and stair climbing. Results were so positive with 51 mm blower fan that halo now has integrated mount for the fan.
[* black] If weight 200 gm mass of HALO and fan are uncomfortable attach a strap spanning top of halo.

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