![]() Some materials deteriorate much faster than others, especially if they are buried in the ground. The material an underground shelter is made from dramatically influences maintenance and lifespan of this type of product. Doors that have been tested to withstand an F5 tornado will be able to verify that they have exceeded FEMA 320 requirements. The most important part of an underground storm shelter is the door. Above ground shelters are available but being above ground simply is not as safe as being in the ground. Granger ISS Tornado Shelter Door FEMA 320/361 Testingīeing under the ground is the safest place to be during a tornado and an underground shelter designed to protect you in these storms is safer than any basement. Granger ISS Tornado Shelter Photo & Features Gallery Click on any of the Thumbnail images below to see the large view open
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