MINI BLAST SHELTER: United States. 1980s to date. Like the Mobile Fallout Shelter demonstration project, the Mini-Blast Shelter was a design project of the Oregon Institute of Science and Medicine. As of 2003 it was still being manufactured by KI4U, Inc. and is represented by that company as being a proven design.
When buried under three feet of earth the shelter is designed to resist up to 50 pounds per square inch of overpressure and to provide a protection factor of 1000. Descriptions of the shelter indicate that it would provide a reasonable chance of survival for occupants in the case of the airburst of current nuclear weapons at a horizontal distance of one to two miles, or good protection from fallout for the first 24 hours after an attack.
The commercially produced version of the shelter is a 4 foot diameter by 12 foot long cylinder of 14 gauge galvanized corrugated steel with two 3 foot tall entry or exit risers, one at each end. The end bulkheads are 10 gauge steel and the blast doors on the risers are 1/4 inch steel plate.
Costs cited are approximately $1,500 if constructed by a local fabricator, and $3,200 from the manufacturer. Installation time, including excavation, is represented as being approximately 2 hours.
Sources: KI4U, Inc., Nuclear Blast & Fallout Shelters FAQ, location http://www.radshelters4u.com/index3.htm, 2003.
Entry 0377 - posted 31 July 2003