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Each shelter comes with a serial numbered seal and certificate provided by the NSSA. The certificate states that the NSSA member attests that this shelter’s design, construction, and installation comply with the ICC/NSSA 500-2008, (International Code Council/National Storm Shelter Association) standard for design and construction of storm shelters and the tornado design criteria for safe rooms presented in FEMA 320-2008, “taking shelter from the storm.”