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 person cannot physically maintain an overpressure with this device, but you can draw in air through the filter bank and into your safe room/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 safe room/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.

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.