Exit devices may be used on labeled doors provided the door labeling specifically states “Fire Door To Be Used With Fire Exit Hardware.” This label indicates that the door has been properly reinforced for fire exit devices. Doors that bear this label must pass a panic loading test in addition to the standard fire test. The panic load test measures the structural capability of the door to allow the hardware to operate in a panic situation. Care must be taken when selecting exit devices for use on fire rated doors, as some devices have been tested for panic loading only, and not fire tested. In addition, exit devices have size and hourly rating restrictions, and must be properly labeled and identified as fire exit hardware.