The ICC-500 test standard demands that manufacturers test each door and frame assembly for each configuration and construction at their maximum and minimum sizes. Currently, national test standards do not exist.Īre “Tornado Resistant Door and Frame Assemblies” available in different sizes?
The Dade County or FBC (Florida Building Code) test has been adopted in some coastal areas of the USA. As well, the hurricane standards require that door/frame units withstand a minimum level of water resistance. In the case of hurricanes, the door/frame units are designed to withstand the relatively light wind loads experienced in a hurricane environment. FEMA 361 is a national standard currently supported by the USA Department of Homeland Security. For tornado testing a 2”x4” at 8’-0” in length is shot at the frame and door at a velocity of 100 mph. As well, the test standard for debris shot at the frame and door assembly for tornado doors occurs at far a greater speed. In the case of tornadoes, the units must resist wind loads up to 250 mph in the unseated (out swinging) position, placing the hinges and multi-point latching bolts under pressure load. Consequently, the standards that govern these products are distinct. The types of wind pressures that doors and frames are subject to in these two instances are completely different. How do “Tornado Resistant Doors and Frames” differ from “Hurricane Doors and Frames”? Doors and frames that comply with this standard have been tested at independent laboratories. This is an American federal standard that has established stringent criteria to resist not only severe wind pressure but also addresses debris damage caused by tornadoes.
#METAL STORM SHELTER DOORS CODE#
Tornado-resistant doors and frames are designed to be resistant to the FEMA (Federal Emergency Management Authority) 361 standard and they are independently tested to the ICC-500 (International Code Council) test standard which simulates an F5 tornado with wind speeds equaling 250 mph. What is the purpose of “Tornado Resistant Doors and Frames”?
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