Impact Window Certification
Most coastal areas and counties have codes that require windows to meet certain standards in order to be deemed a hurricane window. In order for a window to be labeled a hurricane or impact window, it must be tested and stamped with an official seal of approval. One of the requirements for hurricane windows is that they have a DP 45 rating or higher. DP stands for window design pressure. A DP40 window must maintain its structural integrity at up to 155 miles an hour winds from both directions for at least 10 seconds. A DP 50 rated window would have to maintain structural integrity with up to 173 mile an hour winds from both directions for at least 10 seconds.