This automatic ventilation blower is a separate blower that mounts next to the Safe Cell and is used to provide ventilation when the shelter is unoccupied or there is no airborne threat outside. It uses all of the same plumbing as the Safe Cell NBC air filter – the air intake hose from the filter is slipped onto this blower and the air exits the protected space through the overpressure valve.

This separate fresh air blower is unique to the Safe Cell. Other NBC filtration systems have a “fresh air” mode where you bypass the filter elements and use the system blower to bring in unfiltered air. The last thing you want to do is put hours on the blower in your NBC filter just to ventilate your shelter. Save those hours for when you really need them.