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Changes to Step #9

Edit by Guy Kuo

Edit approved by Guy Kuo

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[title] Configuration of PAPR with Fan
[* green] A fan draws room air through an anesthesia viral filter to fill the hood bag. Full mobility is possible with a 12 volt battery pack.
[* black] 51 mm blower fan with 200 pascal static pressure yields about ideal flow. 150 pascal static pressure capacity is probable minimum that allows unencumbered activity.
[* icon_caution] Always verify your Bunny Science PAPR maintains positive to neutral pressure during inspiration. Bag should freely move inward about 1 cm during inspiration. Never modify design to stent bag open. Stenting bag open risks generating negative pressure.
[* icon_note] 51 mm blower fan provides adequate air clearance and permits walking and stair climbing. I have spent hours in the Bunny PAPR with gas sample monitoring to verify flow adequacy.
[* icon_note] Alternative configuration is to replace both flutter valves with another two anesthesia viral filtersfilters or a single VBMAX48 filter. This allows use of Bunny Science PAPR in sterile environments without need a surgical mask inside PAPR.
[* icon_note] Alternative configuration is to replace both flutter valves with another two anesthesia viral filtersfilters or a single VBMAX48 filter. This allows use of Bunny Science PAPR in sterile environments without need a surgical mask inside PAPR.