Thousands of impact resistant windows, doors, and skylights have been tested and certified since Hurricane Andrew ravaged South Florida in 1992, causing billions in property damage. As a consequence of the damage inflicted by Hurricane Andrew, more stringent standards for window systems were adopted. The requirements put into place the following year called for testing of window and door systems and changes to any component--including framing materials, glazing, sealants, weather stripping, hardware and anchors typically necessitated retesting and recertification. This document discusses the many considerations for hurricane product substitution. This document was published in August 2009, and updated in 2019.