Hurricane windows and doors are an investment made to minimize property damage during storms and high winds. However, like all structural materials, they are only effective up to certain levels of force, and still subject to damage in a big enough storm.
The Miami Dade Office of Code Compliance places product standards on hurricane windows installed in its municipality. A window or door is deemed small missile resistant if it can withstand the force of 10 ball bearings traveling 50 mph over the course of 9,000 wind cycles.
A product is deemed large missile resistant by the Miami Dade Office of Code Compliance if it can withstand the force of a 9 lb. piece of lumber traveling 34 mph over the course of 9,000 wind cycles.
Although hurricane windows and doors are very resistant to flying debris and high winds, the structure holding the window in place is not hurricane proof, and the entire window frame is subject to damage if pressure changes in the house are significant enough.
Hurricane windows and doors are considerably more expensive than plywood or shutters and need to be installed by trained professionals.