Abstract
In the light of information available, underground fall-out shelters can be designed to maintain acceptable thermal conditions in temperate or arctic regions for isolation periods of about 2 weeks, with little or no artificial heating or cooling, and with only minimal ventilation. Mechanical cooling of shelters is essential in desert regions and in many hot-humid areas of the south, where soil temperatures at shelter depths are of the order of 75 to 85 ts F, compared with 45 to 55 ts F in the Temperate Zone, and 10 to 30 ts F in subarctic or arctic areas. (auth)
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