Here is a bunker plan from the manual “Installation and Operation Manual for American Safe Room’s Underground Blast Resistant Bomb/Fallout Shelter” The air that is introduced into your protected space needs to be safe, breathable air that is filtered from nuclear, biological, and chemical toxins.

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Description — principals of a protected space
While this shelter is designed to protect the occupants from the kinetic effects (projectiles and debris) of a nearby detonation, a discussion of the nature of air filtration and ventilation in sealed shelters is pertinent to the understanding of this critical aspect of protection. The inside of a shelter is described as a “protected space.” This term is used to describe any enclosure that denies airborne toxins from entering into that space. In order to protect the occupants, you must control the flow of air through this space.

The most efficient means of doing this is with positive pressure (overpressure — or “pressurized” air). In other words, the air inside the protected space is at a slightly higher pressure than normal atmosphere, preventing the migration of toxins into the protected space even if it is not sealed completely. If there is a crack or a small hole in the protected space, the positive pressured and filtered (safe and breathable) air inside will flow outward, instead of toxin laden air flowing inwards. Both static and mobile military protected spaces (command/control centers and vehicles such as tanks) all rely upon this principal.

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The air that is introduced into your protected space needs to be safe, breathable air that is filtered from nuclear, biological, and chemical toxins. This air must be pressurized as it is introduced into the shelter until a preset positive pressure (overpressure) is achieved inside the shelter. This is a function of the fan (blower) inside the Safe Cell and the overpressure relief valve working together to control the pressure inside the shelter. How well the protected space is sealed, and how the air is drawn in, filtered, pressurized, and then expelled must be engineered as a complete system. Air acts as a fluid — taking the path of least resistance in the constant attempt to equalize it’s pressure. This pressure forces the air into your shelter — bringing with it whatever toxins it contains. The significance of treating your protected space as a complete system and not just a collection of separate components thrown together cannot be overstated.

More information how to build your own bunker to save yourself and your family you can find in this free pdf file How to build a Bunker Shelter to survive

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Filed under: 2012 • Survival Guide

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