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Utah Shelter Systems
Complete Shelter Includes: One 36-inch diameter entrance with 90 degree turn and horizontal and vertical runs; one 48 inch diameter entrance with 90 degree turn and horizontal and vertical runs; two hardened blast doors; 6-inch diameter steel intake and exhaust air-vents to surface, with goose neck turn at top; two ladders; complete floor system with removable center panels; AC & DC wiring system with DC light fixtures; ANDAIR VA 150 air ventilation and filtration unit (177 cfm unfiltered & 88 cfm filtered); end plates painted with epoxy rust inhibitor; white on inside surface of shelter body.
If your yard has mature landscaping, sprinkler systems, or large trees, you may want to consider placing your shelter under your driveway, and accessing one entrance from inside your garage.
Swiss shelters for private homes must are built to a minimum code of 1 atmosphere (15 psi), and government civil defense shelters are built to a 45-psi code. Military and critical mission personnel in Switzerland are assigned to heavy blast shelters in the 200-psi plus level. Please take note that our ‘All Hazard’ steel shelters, if installed correctly, also protect to the 200-psi level. We believe these Swiss codes should set the standard for shelters in the United States.
People in America mistakenly believe that shelter ceilings and wall slabs of an 8-inch thickness will protect them from the effects of radiation and blast. They have been misinformed. Eight inches of concrete, with no building overhead, will give a radiation PF of less than 8. Even in low radiation risk areas, this level of protection is not adequate to save lives. The accumulated dose for one week would reach between 300 rads and 600 rads, with an expected probable death rate between 50% and 100%. The minimum blast and radiation requirement, with no building overhead, is 22 inches (see chart below).
Shelters built under a building, however, have an automatic PF of approximately 15, because of the mass of the home and roof above. An eight-inch slab roof under a building will give a PF of about 100. People in low to medium fallout risk areas will most probably survive with no symptoms. People in high fallout risk areas, however, will receive about 200 rads, with some deaths. They will also be expected to have an 11% increase in survivor cancer deaths later in their lives. This concrete level does not meet the 14-inch minimum blast and radiation requirements for shelter slabs under buildings.
The following are the minimum concrete thickness for Swiss standards of 15 and 45 psi.