The code basically breaks down the method to meet the higher window load requirements in two ways: the window itself, and its installation. It says that the window must be able to withstand the “large missile impact” of a 9 pound 2x4 hitting the window at a speed of 34 miles per hour without penetrating the opening. The glass may break, but the opening must not be penetrated. Then, the windows and doors also have to withstand 9,000 cycles of positive and negative air pressure, such that a real hurricane could pull a regular windows right out of its frame.

 

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