| This
hand operated bellows slip-fits instantly
into the top of the Safe
Cell and is operated by pumping it up and down. It is used
to draw filtered air into a protected space
during a long term power outage.
A
typical shelter occupant cannot physically maintain an overpressure
with this device (truth in advertising), but you can draw
in air through the filter bank and into your shelter, displacing
the carbon dioxide that is exhaled by the occupants ~and~
you still have safe, breathable air being filtered
for NBC toxins.
The
constraint for maintaining an overpressure in any decent
sized shelter (larger than a coat closet) is human
endurance - there is simply too much air to move,
either by a plunger system (which we have), or a rotary
crank system, to maintain an overpressure for more than
a few minutes. Either way, the oxygen
that you consume and the carbon dioxide that you exhale
while you bring in filtered air by hand power
is beyond what humans can accomplish.
Our
emergency backup bellows has an output of 50 cubic meters
(1766 cubic feet) per hour at 50 strokes per minute using
a 7 inch stroke and an output of 100 cubic meters (3200
cubic feet) per hour at 50 strokes per minute using a 14
inch stroke.
The emergency backup bellows in
the extended or "up" position
The
emergency backup bellows in the compressed or "down"
position
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