Model BP-3060 Storm Shelter

6 Person Capacity

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Model BP-5363 Storm Shelter

11 Person Capacity


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F Scale vs. EF Scale

The F scale was developed by Dr. Theodore Fujita in order to relate the degree of damage due to high winds, to the intensity of the wind.  This scale rated tornadoes from a F0 to F5, with each category representing a wind speed range.  Since wind speed is not easily measured, it was estimated by evaluating the damage after a tornado or high wind event.  The fallacy in this method was that the damaged structures building materials and strength were not considered.  

The EF scale was developed and is a more precise way to classify wind events.  This scale uses 28 different types of damage indicators, such as building materials, when evaluating the damage after a tornado or other strong wind.

For a very detailed explanation of the EF Scale click here.