Tornadoes, hurricanes and other violent weather can produce winds in excess of 250mph, turning items like cars and trees into deadly projectiles. Chem-Pruf's FEMA door can withstand these forces and have been tested and labeled in accordance with FEMA 320 / ICC 500 requirements for above ground storm shelters for design and construction. FEMA 320 states that swinging door assemblies should resist a static pressure of 1.37-psi for a 5-second period. The tornado test criterion uses a 3 impacts of 15-lb. 2"x4" wood board traveling horizontally at 100-mph, which corresponds to a 250-mph wind. The ICC-500 requirement states that the pressure test load should include a safety factor of 1.2. This pressure relates to a 250 mph ground speed tornado and the door installed in Zones 4&5 per ASCE 7-05 for a corner zone with the negative pressures being greater than the positive pressures.
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