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Architectural Glass: Hurricane-Resistant/StormGlass™
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Tornadoes
The speeds of windborne debris and the peak wind pressures in tornadoes can, in many cases, be much higher than those specified in ASTM E1996. FEMA document specifies a 15lb. wood 2x4 fired at 100 mph. This has approximately 14 times the energy of the large missile used in wind zone 4 of ASTM E1996. Glass and glazing designed and tested, to resist hurricane-impact and cyclic pressure loads can, however give considerable resistance and protection against lower categories of tornadoes.