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The door above, which is the entrance to the shelter of the picture on page 19, is a thick iron foil screwed on to a larger wooden slab. The horizontal bars are pieces of "L" shaped iron rods welded in the wise of a ">" on the iron foil so as to greatly reinforce it. (back to page 23).
The rusty vault is iron, beneath armored concrete.
 

Approximate Distance of Various Effects from Selected Nuclear Air Bursts
* Daytime safe distance
See also:
  
 

Concerning ventilation in a shelter, it ought to be kept present that an adult individual at rest uses about 1.2 calories per minute and to generate them uses 250 cubic centimeters of oxygen, breathing on average 3.75 liters of air. Air contains about 21% of oxygen and, once breathed out, this percentage is lowered to 16.5% since due the the metabolic oxidation process the gas breathed out is carbon dioxide. If the percentage of oxygen in the air decreases of 6%, mental faculties are impaired while an additional decrease of 5% may cause collapse or death.
    
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