Impact windows are, of course, designed to withstand hurricanes and other harsh weather, and they’re rigorously tested with storm simulations to ensure strength and quality in the face of these conditions. That said, it’s important to remember that impact-resistant windows are impact-resistant, not impact-proof. While they’re incredibly durable and engineered specifically to withstand the force of a heavy impact, they’re not totally indestructible. And it’s difficult to say with certainty whether any one specific impact-resistant window would survive a hypothetical Category 5 hurricane. Surely, some impact-resistant windows would survive the storm (i.e., they’re not all just going to simultaneously combust due to the wind and air pressure if a Category 5 storm hits) but if the wind from a powerful Category 5 storm were to hurl a piece of debris at an impact-resistant window, there is certainly a chance that the window could break. Of course, it will depend on what the debris is, how heavy it is, how directly it hits the window, etc.